when determining the pooled population variance estimate for a t test for independent means with unequal sample sizes,: group of answer choices the variance of both of the original populations must be known (as opposed to estimated) the scores from both samples are combined to form a single sample, and the estimated variance is figured in the usual way, but using this combined sample the estimates based on each of the samples are averaged in such a way as to give more influence to the estimate based on more participants the variance of at least one of the original populations must be known (as opposed to estimated), but the other can be estimated from sample scores

Answers

Answer 1

The estimates based on each of the samples are averaged in such a way as to give more influence to the estimate based on more participants.

What is population variance?

Each data point's distance from the population mean is quantified by the population variance, which is a measure of dispersion. The average of the squares of the deviations from the data's mean value is known as population variance.

Hence, when determining the pooled population variance estimate for a t test for independent means with unequal sample sizes, the estimates based on each of the samples are averaged in such a way as to give more influence to the estimate based on more participants.

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Related Questions

Please find out the slope and the y-intercept and put it in the y=mx+b

Answers

Answer:

y = [tex]\frac{3}{4}[/tex]x + 2

Step-by-step explanation:

To find the slope we will use the slope formula of y2-y1/x2-x1.

Our two y values are 2 and -1.

Our two x values are 0 and 4.

2 - (-1) = 3

0 - 4 = -4

3/4 = [tex]\frac{3}{4}[/tex]

y = [tex]\frac{3}{4}[/tex]x + 2

Peter opened up a savings account by making an initial deposit. After the initial deposit, Peter has been adding
$50 to his savings account each month. If after 8 months Peter has a total of $600 in his savings account, what
was the amount of his initial deposit?

Answers

Answer:

$200

Step-by-step explanation:

so if peter has been depositing 50 each month for 8 months then you would just do 50x8 which equals 400 and 600-400=200

Find the value of the product (4a2 + 3b) (4a2+36) at a = 1, b = 2.

Answers

The final value of the product = 292

According to the given equation -

= (4a2+3b)x(4a2+36)

multiply the whole equation-

= 16a4+144+12a2b+108

as we can see that the values of a and b are given 1 and 2 respectively,

so putting the values of a and b in the equation we get -

= 16(1)4+144+12(1)2(2)+108

= 292

The product of the following equation will be = 292

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Evaluate the integral using integration by parts with the indicated choices of u and dv. (Use C for the constant of integration.)

Answers

The integration by part  is [tex]\frac{x^{3}In x }{3} -\frac{x^{3} }{9} +C[/tex] with indicated choices of u and dv.

What is integration by parts?

The method Integration by Parts is known to be a special method of integration that is often useful. In calculus, definite integrals are referred to as the integral with limits such as upper and lower limits. It is also possible to derive the formula of integration by parts with limits.

Given: ∫ [tex]x^{2} In x dx[/tex] ; [tex]u=In x[/tex] ; [tex]dv=x^{2} dx[/tex]

Consider  [tex]u=In x[/tex] and [tex]dv=x^{2} dx[/tex]

⇒ [tex]u=In x[/tex]             ⇒  [tex]dv=x^{2} dx[/tex]

⇒ [tex]du= \frac{1}{x} dx[/tex]           ⇒ [tex]v=\frac{x^{3} }{3}[/tex]

Now, apply integration by parts to solve the integral

∫ u dv =  uv - ∫ v du

the antiderivative of [tex]x^{n}[/tex][tex]=\frac{x^{n+1} }{n+1}[/tex] and the derivative of In x = [tex]\frac{1}{x}[/tex] .

⇒ ∫ [tex]x^{2} In x dx =[/tex][tex]\frac{x^{3} In x}{3} -\frac{x^{3} }{3} .\frac{1}{x} dx[/tex]

                     = [tex]\frac{x^{3}In x }{3}[/tex] [tex]-\frac{x^{2} }{3} dx[/tex]

                     =  [tex]\frac{x^{3}In x }{3}[/tex] [tex]-\frac{x^{3} }{9} +C[/tex]

Hence, the final integration is   [tex]\frac{x^{3}In x }{3}[/tex] [tex]-\frac{x^{3} }{9} +C[/tex]

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what is the product of 5/6 x 4 2/3

Answers

Answer:

35/9

Step-by-step explanation:

Enter the equivalent decimal.
9/9/25

Answers

Answer:

Step-by-step explanation:

.36

In VWX, X ≈ W, WX = 17 and VW = 16. Find XV. HELPPPPP

Answers

Answer:

XV = 16

Step-by-step explanation:

Triangle VWX is an isosceles triangle. Since the base angles are the same, the sides opposite the angle are also the same. See image. They gave VW so XV is the same as VW.

XV=16


The answer would be


Solve negative 5 times y plus seven thirds times y equals negative 5 minus eight thirds times y minus 4 for y.

Infinite solutions
No solution
y = −14
y = 0
NEED A ANSWER ASAP!!!!!!!

Answers

Answer:

None of the Above?

Step-by-step explanation:

1.) If we put this into words, we would get -5y+7/3y=-5-8/3y-4

2.) By moving all y terms to one side, we get -5y + 7/3y + 8/3y = -5 - 4

3.) By simplifying, you would get -4 2/3y = -9.
4.) If you divide both sides by -4 2/3, you would get that y = -9 * - 3/14 = 27/14

There are 4 tomato plants, 8 lettuce plants, and 2 cucumber plants in Jill's garden.

a. What is the ratio of tomato plants to lettuce plants?

b. What is the ratio of lettuce plants to cucumber plants?

Answers

Given

4 tomato plants, 8 lettuce plants, 2 cucumber plants.

Solution

a) The ratio of tomato plants to lettuce plants:

4 ÷ 8  ⇒ 1 ÷ 2

b) The ratio of lettuce plants to cucumber plants:

8 ÷ 2  ⇒ 4 ÷ 1

g please find out how many numbers must be selected from the set 1, 2, 3, 4, 5, 6, 7, 8 to guarantee that at least one pair of those numbers add up to 9 ?

Answers

To guarantee that at least on pair o the numbers adds up to 9, you must select at least 3 numbers from the set by combination

1. First, select any two numbers from the set.

2. Now, calculate their sum.

3. If the sum of the two numbers is not equal to 9, select a third number from the set.

4. Determine the three numbers' sum.

5. If the sum of the three numbers is still not equal to 9, select a fourth number from the set and calculate the sum.

6. Repeat this process until the sum of the selected numbers is equal to 9 by combination

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Your team has contracted to design and build a 500 ft, square-based, open-top, rectangular steal holding tank for a paper company. The tank is to be made by welding thin stainless steel plates together along their edges. As the production engineer, your job is to find dimensions for the base and height that will make the tank weight as little as possible.

Answers

For dimensions of x =10 and y=5 for the base and height that will make the tank weight as little as possible.

Here we are given the information of a square-based, open-top, rectangular steel holding tank, so here the tank is in the shape of a cuboid and we know  the formula  for :

volume = x*y*z, as  here it is a square base, so the volume will be

volume =  x²*y, where x and y are the dimension of the base and height

So for the  given reason,  

=>x²*y =  500

=> y = 500/x²

Again, the surface area formula  will be

S=x²+4xy, substituting the value of  y in this question

=>S=x²+4x(500/x²)

=>S=x²+2000/x

Differentiating the above formula with respect to x, we get

=>2x-2000/x²=0

=>2x³= 2000

=>x³= 1000

=>x =10

so the substituting the x values of x in  the equation y , we get

y = 500/x²

=>y = 5

so the dimensions are x= 10 and y=5

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What are the prime factors of 48?

Answers

Answer:

  48 = 2⁴ · 3

Step-by-step explanation:

You want the prime factorization of 48.

Prime factors

You recognize that 48 is an even number, so you can divide by 2 and see what's left. You can keep doing that until you get a number divisible by another prime:

  48/2 = 24

  24/2 = 12

  12/2 = 6

  6/2 = 3

3 is prime.

The prime factorization of 48 is ...

  48 = 2⁴ · 3

For daniel's lemonade recipe, 4 lemons are required to make 16 cups of lemonade. At what rate are lemons being used in lemons per cup of lemonade?.

Answers

Using mathematical operations we can conclude that the rate of lemons being used in a cup of lemonade is 1/4.

What are mathematical operations?

Calculating a value using operands and a math operator is referred to as performing a mathematical "operation."

The math operator's symbol has predetermined rules that must be applied to the supplied operands or numbers.

In mathematics, addition, subtraction, multiplication, division, and modular forms are the five basic operations.

So, we know that:

Lemons required to make 16 cups of lemonade: 4 lemons

Then, the rate of lemons being used in lemonade per cup:

4/16

1/4


Therefore, using mathematical operations we can conclude that the rate of lemons being used in a cup of lemonade is 1/4.

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how can i tell if an equation is linear/non linear without using a graph?

Answers

Answer:

Using an Equation

Simplify the equation as closely as possible to the form of y = mx + b. Check to see if your equation has exponents. If it has exponents, it is nonlinear. If your equation has no exponents, it is linear.

Answer:

Step-by-step explanation:

To be linear it must have the form  y=mx+b.IN a linear equation the variables are shown in first degree and terms with products of variables are absent .

alice and bob are playing a game in which there are several rounds and each round can be a win, a loss, or a draw for alice. if they play 6 rounds, in how many ways can alice win or draw exactly three times? (answer: 300)

Answers

AS per the permutation concept, the number of ways can Alice win or draw exactly three times is 240

Permutation:

In probability, permutation refers the arrangement of objects in a definite order.

Given,

Alice and Bob are playing a game in which there are several rounds and each round can be a win, a loss, or a draw for Alice.

Here we need to find the number of ways can Alice win or draw exactly three times, if they play 6 rounds.

While we looking into the given question, we know that,

Total number of games = 6

Possible values = 3 ( win, loss, or draw)

Here we need to find the probability of winning 3 times, it can be calculated by using the permutation as,

=> 6! / (6 - 3)!

=> 6! / 3!

=> 120

Similarly, the the probability of draw 3 times, it can be calculated by using the permutation as,

=> 6!/ (6 - 3)!

=> 120

So, the number of ways can Alice win or draw exactly three times is

=> 120 + 120 =  240

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Last year students planted 8 tomato plants and 16 pepper plants in a school garden

Answers

Answer:

whats the question

Answer:

What are you asking?

mr. eaton is ordering sandwiches for a school picnic. the best deal is the 6-foot-long sandwich, which is cut into 4-inch-long pieces. mr. eaton expects 90 people to attend the picnic. he thinks each person will eat 2 pieces. how many 6-foot-long sandwiches should he order?

Answers

He should order 10 sandwiches of 6 foot long so, as to make sure that everyone will eat 2 pieces.

What is Conversion ?

We need to convert between the units in order to ensure the accuracy and to prevent measurement misinterpretation. For example, we do not measure the pencil's length in kilometres. In this situation, one must convert from kilometres (km) to centimetres (cm) (cm). In most cases, multiplicative conversion factors are used to convert one unit to another of the same quantity. Let's see how to change the length and mass units.

1 Feet = 12 Inches

So, 6 Foot = 72 inches

The Length of sandwich- piece is 4 inch

So, when we convert 6 foot long sandwich into 4 inch,

Then we get number of piece is = 72/4 = 18

From 6 foot long sandwich we get 18 pieces of 4 inch long sub.

Now, Total people who will attend picnic is 40

and each people will eat 2 pieces.

It means total number of piece required = 2 (90) = 180

Mr. eaton required 180 pieces of sandwiches.

Number of sandwiches = 180 / 1.8 = 10

He should order 10 sandwiches of 6 foot long.

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Im so confused with this question 21≥3(a-7)+9

Answers

Answer:

I got you!

a ≤ 11

For more info, look at the steps in the attached image!

Step-by-step explanation:

Answer:

a ≥11

Step-by-step explanation:

[tex]21 \geqslant 3a - 21 + 9 \\ 21 \geqslant 3a - 12 \\ 21 + 12 \geqslant 3a - 12 + 12 \\ 33 \geqslant 3a \\ 3a \leqslant 33 \\ a \geqslant 11[/tex]

PLEASE HELP ME ASAP !!!!!!!!!!!!!!!!!!!

Answers

The triangles in the diagram indicates that ΔABD is an isosceles triangle, therefore;∠2 ≅ ∠1

The two-column method can be used to prove that the angle m∠BAC > m∠C as follows;

Statement       [tex]{}[/tex]                         Reasons

1. BC > BA       [tex]{}[/tex]                         1. Given

2. BA ≅ BD      [tex]{}[/tex]                        2. Given

3. ΔABD is an isosceles Δ[tex]{}[/tex]      3. Definition of isosceles triangle

4. ∠1 ≅ ∠2      [tex]{}[/tex]                         4. Base ∠s of isosceles triangle ΔABD

5. ∠1 = ∠2      [tex]{}[/tex]                          5. Definition of congruency

6. ∠1 = ∠3 + ∠C      [tex]{}[/tex]                 6. Exterior angle theorem

7. ∠2 = ∠3 + ∠C      [tex]{}[/tex]                7. Substitution property

8. ∠2 - ∠3 = ∠C [tex]{}[/tex]                     8. Subtraction property

9. ∠2 > ∠C [tex]{}[/tex]                             9. Definition

What is an isosceles triangle?

An isosceles triangle is a triangle that have a pair of congruent sides and one pair of congruent angles.

The reasons in the above two-columns used to prove m∠BAC > m∠C are as follows;

Isosceles triangle ΔABD

The triangle ΔABD that have side AB congruent to side BD is an isosceles triangle by definition of an isosceles triangle.

The base angles of an isosceles triangle that are angles opposite congruent sides in a triangle are also congruent.

Definition of congruency

A geometric figure is congruent to another figure if their measurements are the same.

Exterior angle theorem

The exterior angle of a triangle theorem states that the exterior angle of a triangle is equal to the sum of the two interior opposite angles.

Substitution property

The substitution property of equality states that if a quantity a is equal to another quantity b then a can be substituted by b in expressions and equations without changing their value.

Subtraction property

The subtraction property of equality states that if the same quantity is subtracted from both sides of an equation, then the new amount obtained are also equal

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What fraction is a hour in 20 mins

Answers

20 minutes is [tex]1/3^{rd}[/tex] of an hour

find the open intervals on which the function ​f(x)axbx​c, a​0, is increasing and decreasing. describe the reasoning behind your answer.

Answers

The intervals on which the function f(x) = ax² + bx + c (where "a" doesn't = 0) is increasing and decreasing is x>-b/2a and x<-b/2a

Given that,

We have to find the intervals on which the function f(x) = ax² + bx + c (where "a" doesn't = 0) is increasing and decreasing.

We know that,

Take the function equation,

f(x)=ax² + bx + c

The derivative of the function of x is  

f'(x)=ax+b

So, f(x) is increasing when f'(x) > 0

f(x) is decreasing when f'(x) < 0

Then we can say

f'(x) > 0 , when  b > 0  and a < 0

2ax + b < 0

2ax < - b

x<-b/2a

Now,

f'(x) < 0 , when  b < 0  and a > 0

2ax + b > 0

2ax > - b

x>-b/2a

Therefore, the intervals on which the function f(x) = ax² + bx + c (where "a" doesn't = 0) is increasing and decreasing is x>-b/2a and x<-b/2a.

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the given pattern continues. write down the nth term of the sequence suggested by the pattern 1/18, 2/19, 3/20, 4/21

Answers

The nth term of the pattern is (1+n)/(18+n)

What is a sequence?

succession is the act of doing something after another. successional order: a list of books organized by title. a running or interconnected sequence: a series of sonnets. something that happens after; a following event; a result; or a repercussion. In contrast to a set, the order of the components in a sequence does important, and the same elements may occur more than once at various positions. A series can officially be described as a function from natural numbers.

We are given a sequence

1/18, 2/19, 3/20, 4/21

As we can see the second term is (1+1)/(18+1)

Third term is (1+2)/(18+2)

Hence the n th term of the sequence can be given as (1+n)/(18+n)

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Carlos wants to buy some new video games. Each game he buys costs him $36. Is the relationship between the number of games Carlos buys and the total price proportional?

Answers

The relationship between the number of games Carlos buys and the total price is proportional.

What is a proportional relationship?

A proportional relationship exists between two or more variables if they move in the same direction. If one of the variables increases, the other variable increases.

As the number of games that are bought increases, the total price paid also increases. This means that the relationship is proportional.

The formula that is used to represent proportional relationship is:

T = kg

Where:

T = total price k = constant g = number of games bought

T = $36g

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Write code using the range function to add up the series 15, 20, 25, 30,. 50 and print the resulting sum each step along the way.

Answers

The range function to add up the series is 15 ,35 ,60 ,90, 125,165,210 ,260

What is a python function?

A unit of code with a name is referred to as a function in Python. We utilize functions anytime we need to repeat a process repeatedly without writing the same code.

Given: Series 15, 20, 25, 30,.. 50

Program (Pascal ABC) and Result:

Program:

Var i, Summ : integer;

begin

i : = 15;

Summ : = 15;

While i <= 50 do

begin

WriteIn ( '   ' , Summ)  ;

i : = i + 5 ;

Summ : = Summ + i ;

end ;

end.

Result : 15 ,35 ,60 ,90, 125,165,210 ,260

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suppose that based on a random sample, a 95% confidence interval for the mean hours slept (per day) among graduate students was found to be (6.5, 6.9). what is the margin of error of this confidence interval? responses

Answers

The margin of error for the confidence interval (6.5, 6.9) is 0.2 , the correct option is (c) .

In the question ,

it is given that ,

the 95% confidence interval for mean hours slept in the graduate students is (6.5, 6.9) ,

we have to find the margin of error ,

we know that the formula for the margin of error is

= (upper limit of confidence interval - lower limit )/2

From the given interval ,

we see that ,

upper limit of confidence interval = 6.9

lower limit of confidence interval = 6.5

Substituting the above value in margin of error formula ,

we get ,

margin of error = (6.9 - 6.5)/2

= 0.4/2

= 0.2

Therefore , the margin of error is 0.2   .

The given question is incomplete , the complete question is

Suppose that based on a random sample, a 95% confidence interval for the mean hours slept (per day) among graduate students was found to be (6.5, 6.9). What is the margin of error of this confidence interval? responses

(a) 6.7

(b) 0.4

(c) 0.2

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calculate the expected return for stocks a and b. (do not round intermediate calculations and enter your answers as a percent rounded to 2 decimal places, e.g., 32.16.)b.calculate the standard deviation for stocks a and b.

Answers

a) The expected return for stocks a and b is 13.56% and 20.02% respectively.

b) The standard deviation for stocks a and b are 8.32% and 32.60%.

a) Expected return = Probability of recession × Return during recession + Probability of normal × Return during normal + Probability of boom × Return during boom

Expected return for stock A = 0.21 × 0.04 + 0.61 × 0.12 + 0.18 × 0.30

The expected return for stock A = 0.1356

The expected return for stock A = 13.56%

Expected return for stock B = 0.21 × (-0.41) + 0.61 × 0.31 + 0.18 × 0.54

The expected return for stock B = 0.2002

The expected return for stock B = 20.02%

b) Standard deviation of stock = √{Probability(Recession) × (Rate during recession - expected rate )² + Probability(Normal)(Rate during normal - expected return)² + Probability(Boom) × (Rate in boom - Expected return)²}

Standard deviation of stock A = √[(0.21 × (0.04-0.1356)² + 0.61 × (0.12 - 0.1356)² + 0.18 × (0.30-0.1356)²)]

The standard deviation of stock A = 0.0832

The standard deviation of stock A = 8.32

Standard deviation of stock B = √(0.21 × (-0.41-0.2002)² + 0.61(0.31 - 0.2002)² + 0.18 × (0.54-0.2002)²)]

The standard deviation of stock B = 0.3260

The standard deviation of stock B = 32.60%

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What value does each equation need to be multiplied by in order to eliminate the x-terms?

Equation 1: 6x − 5y = -4
Equation 2: 4x + 2y = 28

Please help

Answers

You need to find what x is equal to for each equation, so you can sub why x is equal to in the place I'd x to eliminate the variable

1. 6x-5y=-4

6x=5y-4

X=5/6y-2/3

2. 4x+2y=28

4x=-2y+28

X=-1/2y+7

Hope this helps!

A flagpole casts a 20-foot shadow at the
same time Lexi casts a 5-foot shadow. If
Lexi is 5'9", find the height of the flagpole.

Answers

Answer:

20-foot shadow

Step-by-step explanation:

guillermo bought textbooks and notebooks at the bookstore . the number of textbooks was three more than twice the number of notebook .he hought seven textbooks . how many notebooks did he buy?

Answers

2 notebooks

Step-by-step explanation:

the variables I'm gonna use are t for textbooks and n for notebooks

t = (n•2)+3 (two times the notebooks then add 3)

now we'll plug in the amount of notebooks we have so t=7

7=(n•2)+3

we can subtract 3 from each side that leaves us with

4=n•2

then divide by 2

2=n

Guillermo bought 2 notebooks

Find an equation in​ point-slope form for the line having the slope m=2 and containing the point (8,2)

Answers

Point-slope form of a line is

y - y1 = m(x - x1)

where:
m = -3/4
(x1, y1) = (-8, 9)


Plug in these values into the form.
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When she was a child, she was so shy that she would to hide under the table at the sight of a visitor.8. Your mother is not used to change her mind, my dear.9. She would better not try any cheating next time.10. Id rather dont go there. The half-life of potassium-42 is approximately 12 hours. How long will it take for the radiation level of potassium-42 to drop to 1/16 of its original level?. what do you predict will happen to the paramecium cell when it is placed in a freshwater environment? Calculate the relative molecular mass of aspartame. The yield to maturity on one-year zero-coupon bonds is 7.4%. The yield to maturity on two-year zero-coupon bonds is 8.4%.a. What is the forward rate of interest for the second year? (Do not round intermediate calculations. Round your answer to 2 decimal places.) Forward rate of interestb. If you believe in the expectations hypothesis, what is your best guess as to the expected value of the short-term interest rate next year? (Do not round intermediate calculations. Round your answer to 2 decimal places.) Short-term interest rate %c. If you believe in the liquidity preference theory, is your best guess as to next year's short-term interest rate higher or lower than inO Higher O Lower can someone help me? I can't get rid of this test and it won't let me do it, I really don't know what to do and my grades will start to go down because I can't do it. (sorry if none of this makes sense) in the stock market, changes in value used to be indicated by fractions, which represented portions of $1. if a stock had a value of $11.50, write and evaluate an addition expression to find how much the stock is worth after an increase of 1/4 a school atmosphere in which the motions of teaching and learning continue, while the students are more concerned about surviving than learning, is called blank. What implied powers wouldCongress likely have becauseof the expressed power tostablish post offices? a sample of xenon gas occupies a volume of 6.51 l6.51 l at 473 k.473 k. if the pressure remains constant, at what temperature will this same xenon gas sample have a volume of 3.33 l? Which of the items listed below not an example of a political motivation?Question 1 options:a) Powerb) Peacec) Caringd) Prosperitye) Ideology Nuclear decay occurs according to first-order kinetics. How long will it take for a sample of chromium-51 to decay from 35. 0 grams to 10. 0 grams? the half-life of chromium-51 is 28 days. Briefly explain how each of the following influences the tensile modulus of a semicrystalline polymer and why: (a) molecular weight (b) degree of crystallinity (c) deformation by drawing (d) annealing of an undeformed material (e) annealing of a drawn material The picture below shows a valley in Oregon. Which of the following caused the features in the image?A. continental glaciersB. groundwaterC. streamsD. alpine glaciersE. wind Given a line of text as input, output the number of characters excluding spaces, periods, or commas. You may assume that the input string will not exceed 50 characters. Use fgets() function to read in the input from stdin. You can then use strlen() to determine how many characters to process one by one. Ex: If the input is: Listen, Mr. Jones, calm down. the output is: 21 Note: Account for all characters that aren't spaces, periods, or commas (Ex: "/", "2", "!"). 355346.2168560.qx3zqy7 LAB ACTIVITY 12.7.1: LAB: Read and Analyze Input 0/50 main.c Load default template... 1 #include 2 #include 4 int main(void) { 5 /* Type your code here. */ 7 8 return 0; 93 101 teaching skills for a learner to demonstrate an awareness of the environment as it relates to social skills and pro-social relationships falls under which domain of the social skills taxonomy? which type of emergency assessment is being performed when the nurse is inserting a gastric tube and arranging for diagnostic studies for a client who sustained injuries after a bus accident?