Answer:
The calculated value of t= -1.118860 does not lie in the critical region t= -1.714 or t= -2.5. Therefore we accept our null hypothesis that the mean score for Group 1 is significantly lower than the mean score for Group 2 for both significance level of 0.05 and 0.01
Step-by-step explanation:
Groups Sample Size Mean Standard Deviation
1 11 65 4.7
2 16 74 2.5
Formulate null and alternate hypotheses as
H0 : u1 < u2 against Ha: u1 ≥ u 2
That is the mean of the group 1 is lower than the mean of the group 2
Degrees of freedom is calculated df = υ= n1+n2- 2= 11+16-2= 23
The significance level alpha is chosen to be ∝ = 0.05
The critical region t ≤ -t (0.05, 23) = -1.714
And if we choose alpha = 0.01 the critical region would be
t ≤ -t (0.05, 23) = -2.5
Here the difference between the sample means is x`1- x`2= 65-74= -9
The pooled estimate for the common variance σ² is
Sp² = 1/n1+n2 -2 [ ∑ (x1i - x1`)² + ∑ (x2j - x`2)²]
= 1/11+16-2 [ (65)²+(74)²]
= 1/23[ 4225+5476]
= 1/23[9701]
=421.782
Sp =√ 421.782=20.5373
The test statistic is
t = (x`1- x` ) /. Sp √1/n1 + 1/n2
t= -9/ 20.5373√1/11+ 1/16
t= -9/8.0439
t= -1.118860
The calculated value of t= -1.118860 does not lie in the critical region t= -1.714 or t= -2.5. Therefore we accept our null hypothesis that the mean score for Group 1 is significantly lower than the mean score for Group 2 for both significance level of 0.05 and 0.01
select all expressions to 6x-24
Answer:
it's the first one and the third one
Step-by-step explanation:
cause 6 (X - 4) multiply by 6 by X and 4
and same for the third expression.
Answer:
1st and 3rd
Step-by-step explanation:
6(x - 4) = 6x - 24
3(2x - 8) = 6x - 24
What is the solution for x divided by 9>4
Answer:
x>36
Step-by-step explanation:
Multiply 4 by 9 to get x>36
1) The perimeter of a square is 16 inches. What is the length of each side?
4 inches
8 inches
64 inches
32 inches
Done >
Danny purchases a shirt for $30. The store charges him 8% sales tax on the purchase. How much sales tax will the store charge on the purchase?
Answer:
tax = $30.00 * 8% tax = $30.00 * 0.08 tax = $2.40
Step-by-step explanation:
Please answer this correctly without making mistakes
Answer:
16
Step-by-step explanation:
The distance is given by
d = sqrt( (x2-x1) ^2 + ( y2-y1) ^2)
Since the x values are the same
d = sqrt( ( y2-y1) ^2)
d = sqrt( (( -6 - 10)^2))
d = sqrt((-16) ^2)
d = 16
We can also just find the number of squares between the points since the x value is the same.
10 - -6
10+6
16
Answer:
16
Step-by-step explanation:
10 - -6 = 10 + 6 = 16
Simplify 32 ⋅ 35. (4 points)
Question 3 options:
1)
37
2)
310
3)
97
4)
910
Answer:
Jul 25, 2019 — Click here to get an answer to your question ✍️ 3. Simplify 32 • 35 ... 3. Simplify 32 • 35. (4 points) 37 310 97 910. 2. See answers. Log in to ...
2 answers
Step-by-step explanation:
Please help me answer this with the correct answer :)
Explain your answer
I will give braisnlt :)
Answer: b
Step-by-step explanation:
2 divided by 9/10 (in fraction or mixed number form)
Answer:
decimal: 2.22 mixed number: 2 2/9
HELP MY HOMEWORK SO HARDDDD
Answer:
6.7
Step-by-step explanation:
Theres a formula to figure this out. If you know two sides of a right angle triangle you can find the third.
Use the formula a²=b²+c², where a is the side opposite the right angle and b and c are the other sides.
a²=b²+c²
7²=2²+c²
49=4+c²
49-4=c²
c=√45 or 6.7082039325
it cost Naomi $7.70 to send 154 text messages how many text messages did she send if she spent $5.25
Answer:
105 text messages
Step-by-step explanation:
7.70 divied by 154 = 0.05
0.05 per text massage
5.25 divided by 0.05 = 105
to check work:
105 times 0.05 = 5.25
Answer:
The answer to your question is 105 i had the same problem as you
Find the value of each expression
-22-(-5)
Answer:
-17
Step-by-step explanation:
-22-(-5) = -22+5 = -17
Answer:
the answer is -17
Step-by-step explanation:
-22-(5)-22+5=-17
luke bought 6 pretzels for himself and friends he spent a total of $13.50 let p represent the price of one pretzel
Answer:
6p=$13.50
Step-by-step explanation:
Which numerical expression represents, two fifths of the product of five eighths and sixteen? please help
9514 1404 393
Answer:
[tex]\dfrac{2}{5}\times\left(\dfrac{5}{8}\times 16\right)[/tex]
Step-by-step explanation:
In this context, "of" means "times". A product of two numbers is computed by taking one "times" the other. In short, the operations being described by the words are two uses of "times". That shows up in only one answer choice.
100 points and brainliest for best answer please i need help
Write 4x^2 + y^2 - 32x + 4y + 52 = 0
Answer:
dy/dx= -4x+16/y+2
Step-by-step explanation:
just cause also if you need to classify then it's ellipse (this is to find the first derative)
do you need it in standard form
can you help me i have only one day
Answer:
n = -1.825
Step-by-step explanation:
8n + 16.2 = 1.6 (Given)
8n = -14.6 (Subtract 16.2 on both sides)
n = -1.825 (Divide 8 on both sides)
Step-by-step explanation:
Move all terms not containing
n
to the right side of the equation.
Tap for fewer steps...
Subtract
16.2
from both sides of the equation.
8
n
=
1.6
−
16.2
Subtract
16.2
from
1.6
.
8
n
=
−
14.6
Divide each term by
8
and simplify.
Tap for fewer steps...
Divide each term in
8
n
=
−
14.6
by
8
.
8
n
8
=
−
14.6
8
Cancel the common factor of
8
.
Tap for more steps...
n
=
−
14.6
8
Divide
−
14.6
by
8
.
n
=
−
1.825
At a bagel shop the first 6 bagels purchased cost 55 cents apiece, and additional bagels cost c cents apiece. If a customer paid $5.70 for 12 bagels, what is the value of c?
Answer:
C = 0.475
Step-by-step explanation:
you divide 5.70 by 12 and get that one bagel costs 0.475 cents. hope this helps!
c=40 is the answer
6x55=330 cents
$570-570 cents (570-330)÷(12-)
=240÷6 (division)
=40 cents
Thus, c=40
What is the unitary method?The unitary method is a method for solving a problem by first finding the value of a single unit and then multiplying the value of a single unit to find the required value.
The unitary method is a procedure that calculates the value of a single unit from the value of multiple units and the value of multiple units from the value of a single unit.
Simply put, the unitary method is used to find the value of a single unit from a given plural. For example, if the price of 40 pens is 400 rupees, the price of one pen would be: This can be done using a uniform method
Learn more about unitary method here:https://brainly.com/question/24587372
#SPJ2
estimate 7/8 of 4/5. I will give brainiest
Answer:
0.7
Step-by-step explanation: I used a calculator.
. log 3x4
Expand each expression
Answer:
12
Step-by-step explanation:
because 3x4 is 12
solve the question below
Answer:
The answer is below
Step-by-step explanation:
1) A triangle is a polygon with three sides and three angles. There are different types of triangles such as obtuse, scalene, right angle, equilateral and isosceles triangle.
Given that triangle ABC is right angled and AC = 25 cm = hypotenuse and BC = 15 cm. Using Pythagoras:
AC² = BC² + AB²
25² = AB² + 15²
AB² = 25² - 15²
AB² = 400
AB = √400
AB = 20 cm
Using sine rule:
[tex]\frac{sin(B)}{AC}=\frac{sin(A)}{BC}=\frac{sin(C)}{AB}\\\\But\ \angle B= 90^o(right\ angle)\ hence:\\\\ \frac{sin(B)}{AC}=\frac{sin(A)}{BC}\\\\\frac{sin(90)}{25}=\frac{sin(A)}{15}\\\\sin(A)=\frac{sin(90)}{25}*15\\\\sin(A)=0.6\\\\A=sin^{-1}(0.6)\\\\A=36.87^o[/tex]
2)
Using Pythagoras:
hypotenuse² = 8² + 6²
hypotenuse² = 100
hypotenuse = √100
hypotenuse = 10
Using sine rule:
[tex]\frac{sin(x)}{8}=\frac{sin(90)}{10}\\\\sin(x)=\frac{sin(90)}{10}*8\\\\sin(x)=0.8\\\\x=sin^{-1}(0.8)\\\\x=53.13 ^o[/tex]
Devante has a lunch account in the school cafeteria His starting balance at the beginning of the month is $35.50. The first wook, Davante bought 3 lunches and his account balance was $28.00. The second week. Devante
bought 5 lunches and his account balance was 515 50
In a model that relates the balance of his lunch account as a function of the number of lunches he buys, what does the rate of change represent?
A: the number of lunches he purchases
B: the starting balance of his lunch account
C: the amount of money in his lunch account
D: the amount of money he pays for each lunch
Answer:
D the amount of money he pays for each lunch
Step-by-step explanation:
In each lunch Devante has, he pays 2,50 $ according to:
Money in t = t₀ he has 35,50 $ paid 3 lunches and spent
35,50 - 28 = 7,5
Then the cost of each lunch is 7,5 / 3 = 2,5 $
After that
bought 5 lunches and spent 28 - 15,5 = 12,50
Again 12,5 / 5 = 2,5 $
Now the model for the situation is a straight line with a slope 2,5
In an x , y cartesian system in which y is money in the account and x is the number of lunches, such a straight line will be
y = b - m*x ( b the intercept on y and m the negative slope)
y = 35,50 - 2,5*x
So answering the question is lyrics D the amount of money he pays for each lunch
The table and graph shows the height and weight of 10 basketball players. Which statement is true
Answer:
"a 72 inch player would probably weigh about 160 pounds"
Step-by-step explanation:
Order the numbers from least to greatest
Answer:
1. sqrt of 7, sqrt of 22, 5
2. 2, sqrt 8, 3, sqrt 10
3. 2.5, sqrt 9, pi
4. pi, sqrt 10, 3.5
Step-by-step explanation:
The polygons are similar. Solve for x.
scale factor from A to B = 3:5
Answer:
9
Step-by-step explanation:
if scale factor is 3/5, then
(x+12):35=3:5, ⇒
[tex]\frac{x+12}{35} =\frac{3}{5}; x=21-12; x=9[/tex]
18.96 x 2.03 correct to two significant figures equals
BIG COW LITTLE COW FAT COW ADORABLE COW
BIG RAT LITTLE RAT FAT RAT ADORABLE RAT
BIG CAT LITTLE CAT FAT CAT ADORABLE CAT
Answer:
BIG DOG LITTLE DOG FAT DOG ADORABLE DOG
BIG LLAMA LITTLE LLAMA FAT LLAMA ADORABLE LLAMA
BIG ELEPHANT LITTLE ELEPHANT FAT ELEPHANT ADORABLE ELEPHANT
k(4 - 17) in expanded form
Answer:
I think Its k x (4 - 17)
You're Welcome =D
The student council needs posters for the Winter Carnival. The print shop charges $15 for each print job. Each poster will cost an additional
$1.35.
Which equation shows the relationship between the number of posters, n, and the total cost, c, in dollars?
O A. c = 1.35n + 15
O B. n = 1.35n + 15
O C. c = 16.35n
O D. n = 16.35c
Answer: A. c = 1.35n + 15
Step-by-step explanation:
Given: Charge for each job = $15
Additional cost per poster = $ 1.35
Total cost = Charge for each job + (Additional cost per poster) (Number of posters) ...(i)
Varaibles:
c= Tota; cost for n posters.
Substitute all values in (i), we get
[tex]c=15+1.35n[/tex]
Hence, the required equation : c = 1.35n + 15
Hence, the correct option is A. c = 1.35n + 15.
Find x.
20 cm
12 cm
Х
X =
cm
12 The sixth grade at Johnson Middle School set a goal to raise $8,000 for their end-of -the-year field trip to Washington DC. September December March $10,000 $10,000 $9,000 $9,000 $8,000 Goal $7,000 $10,000 $9,000 $8,000 Goal $8,000 Goal $7,000 $7,000 $6,000 $5,000 $6,000 $5,000 $4,000 $3,000 $2,000 $1,000 $6,000 $5,000 $4,000 $4,000 $3,000 $3,000 $2,000 $1,000 $2,000 $1,000 60 Grade Grade 6 Grade (a) On the first day of school, Bethany's family donated $60 to the field trip fundraiser. What percent of their total goal did Bethany's family donate? F 0.75% G 75% H 2.5% J 0.25%
Answer:
0.75%
Step-by-step explanation:
Total amount to generate at fundraiser = $8000
Amount donated by Bethany family = $60
The percentage of Bethany's donation towards the fundraiser is :
Let percentage = x
x% of 8000 = 60
x/100 * 8000 = 60
0.01x * 8000 = 60
80x = 60
Divide both sides by des by 80
80x / 80 = 60 / 80
x = 0.75
please help. please. dont answer if you dont know the actual answer please!!!
Answer:
its c
Step-by-step explanation:
f(x)=3.5*