a researcher wants to know the typing speed of the students in a large vocational school. the population standard deviation is previously known to be 2.5 minutes. if the researcher wants a margin of error of 0.50 minute and an alpha level of 0.05, what should be the sample size?

Answers

Answer 1
1) It is known that a laboratory task takes the average person 2.5 seconds. A researcher was interested in whether older people are slower (take longer) on this task. The researcher tested 30 randomly selected 80-year-olds. Their mean time was 2.7 seconds, with an estimated population standard deviation of 1.4 seconds. What should the researcher conclude (use the .05 level)? a. /2 Identify the populations involved: population 1 = _____________________________________________________________________ population 2 = _____________________________________________________________________ b. /2 State the research and null hypothesis: Research Hypothesis = _____________________________________________________________ Null Hypothesis = _________________________________________________________________ c. /6 Determine the characteristics of the comparison distribution (hint: it is a distribution of means): mean of the distribution of means = degrees of freedom = estimated population variance = estimated population standard deviation = variance of the distribution of means = standard deviation of distribution of means = d. /1 Cutoff sample score on the comparison distribution at which we’ll reject H0 (hint: 1 or 2 tails?) = e. /1 Determine your sample’s score on the comparison distribution = f. /1 Accept or reject the null hypothesis? g. /4 Sketch the distributions involved:

Related Questions

You and a friend were invited to a party you both were asked to bring pizzas and chips

Answers

What is the full question!?

Answer:

Then if each would bring 1 of each so there would be 2 pizzas and 2 bag of chips

Step-by-step explanation:

lol id.k/ if this was supposed to be a joke but here I am ◑﹏◐

−4.5=−0.5(x−7.1)

solve for x and teach me how to give brainliest

Answers

-4.5 = -0.5 (x - 7.1)

-4.5 = -0.5x + 3.55
-3.55 -3.55
——————————
-8.05 = -0.5x
———————
-0.5

X = 16.1

Please help me I tired of keep asking. If you have a heart you would help me and give me the right answer Please (NO LINKS) (NO LYING )

Answers

Answer:quit

Step-by-step explanation:that looks lard

Can someone provide some assistance.​

Answers

Answer:

m<E=120°

m<T=60°

Step-by-step explanation:

10m+4m+12=180

14m=168

m=12

m<E=10m=10(12)=120

m<T=4m+12=4(12)+12=48+12=60

Answer:

Solution given:

10m+4m+12=180°[sum of opposite angle of cyclic quadrilateral is supplementary]

14m=180-12

m=168/14=12

m<E=10×12=120°

m<T=4×12+12=60°

What is the Total number of Outcomes for a family of 3 with having boys and girls?

Answers

There are 8 possible outcomes, all equally likely (if we assume each gender is equally likely). Hence the choice is 3/8. We can also think about it in at least one more way: You identified all the possible ways to get 2 boys and one girl.

Renata and her family go through an average of more than 15 cans of sparkling water each day. They buy cases of 24 cans at $3.50 a case. Write an inequality for the number of cases they go through in 30 days. ​

Answers

Answer: The inequality required to express the above condition is   x     ≥    18.75

Step-by-step explanation:Renata and her family go through an average of more than 15 cans of sparkling water each day.

The number of cases of 24 cans of sparkling water.

We can take the number of cases to be x.

Each case is said to cost $3.50.

An inequality for the number of cases that Renata's family go through in 24 days can be written as

      x ≥            ⇒     x    ≥            ⇒   x ≥     18.75

Therefore the inequality required to express the above condition is

x     ≥    18.75

How many negative real zeros does f(x) = x^5 - 2x^4 - 4x^3 + 4x2 – 5x + 6 have?

A. 3
B. 2
C. 1
D. 0

Answers

the answer is d. hope this helped

What is 1/5 x 2 multiplying fractions with whole numbers

Answers

Answer: 0.4

Have a nice day!

Answer:

0.4 or 2/5

Step-by-step explanation:

You can solve this question by doing [tex]\frac{1}{5}[/tex] x [tex]\frac{2}{1}[/tex] to get the answer of [tex]\frac{2}{5}[/tex] or 0.4.

are 12(x-12) and 12x-24 equivalent

also

are 7+3(5d-2) and 13 + 15d equivalent​

Answers

Answer:

1. Yes they are

2. No they are not

hope this helps :)

Step-by-step explanation:

What is the amplitude of the function?

Answers

Answer:

Step-by-step explanation:

The amplitude is half of the range.

a=(maximum-minimum)/2, in this case

a=(2-(-4))/2

a=6/2

a=3

IXL 6th grade FF.1



Im having truoble need some hellllllpppp!!?!!!


Pleas..

Answers

Answer:

p=5

Step-by-step explanation:

if 5+3 = 8

13-8=5

and both sides of the triangle need to be the same

Answer:

its 5

Step-by-step explanation:

5 + 3 + p = 13

p=5

WORTH 35 POINTS!!! Annie’s dad travels for business. On Monday, he drives for 4 hr. at a constant rate of 55 mph to meet with a customer. On Tuesday, he drives 3 hr. at a constant rate of 50 mph to meet with his district sales manager. On Wednesday, he drives 2 hr. at a constant rate of 60 mph to pick up supplies at the warehouse. How many miles does Annie’s dad drive total before he heads for home?
A. 120 mi.
B. 150 mi.
C. 220 mi.
D. 490 mi.

Answers

Answer:

220mi

Step-by-step explanation:

Annie's dad drove a total of 490 miles before heading home. The correct option is D.

What is the distance?

Distance is defined as the product of speed and time.

We can use the formula distance = rate x time to calculate the distance for each day.

On Monday, he drove for 4 hours at 55 mph, so the distance he traveled was:

distance = 55 mph x 4 hours = 220 miles

On Tuesday, he drove for 3 hours at 50 mph, so the distance he traveled was:

distance = 50 mph x 3 hours = 150 miles

On Wednesday, he drove for 2 hours at 60 mph, so the distance he traveled was:

distance = 60 mph x 2 hours = 120 miles

To find the total distance, we can add up the distances for each day:

220 miles + 150 miles + 120 miles = 490 miles

Therefore, Annie's dad drove a total of 490 miles before heading home.

Learn more about distance here:

brainly.com/question/13269893

#SPJ3

Sam opened a saving account with a deposit and then started saving the same amount each
month. After 3 months Sam had $325 in he account. After 7 months she had $625 in her
account. Write an equation for this situation.

Answers

The answer would be <3

7 ft equals blank inches ​

Answers

Answer:

it is 84 inches all together

Answer:

84 inches

Step-by-step explanation:

have a good day

may i please  get a branlillest

A catering company charges a flat fee of 120$ to cater an event...

Answers

The set of numbers greater than 20

Which number line represents the solution of 5X < 30

Answers

Answer:

Step-by-step explanation:

Answer:

BRO, where are the number lines, can't help you if you dont put the number lines

sarah has 3 dozen eggs. she sold 3/4 of her eggs, how many eggs did she sell?​

Answers

Answer:

27

Step-by-step explanation:

GAtyyyyyrtrrreererwrqweqweqweqweqweqdew

Answers

what is this bro :))))))))))))?

Answer:

what's your questions

Step-by-step explanation:

please give me brain list and follow

what is the solution to the system of equations?
3x - 6y = -12
2x - 4y = -16

please help!!

Answers

Solve for
x
x in
3
x

6
y
=

12
3x−6y=−12.
x
=
2
y

4
x=2y−4

2 Substitute
x
=
2
y

4
x=2y−4 into
2
x

4
y
=

16
2x−4y=−16.

8
=

16
−8=−16

3 Since

8
=

16
−8=−16 is not true, this is an inconsistent system.
No Solution

help with math please it means the world to me!!

Answers

Answer:

10 units^2

Step-by-step explanation:

Ashley and Emma are reading the same article. Ashley is on page 1 of the article, but she can read 1 page per minute. Emma is already on page 5, but reads a page every 3 minutes.

What page is Ashley on after 5 minutes.

What equation can be used to represent the amount Emma has read?

How many minutes does it take before Ashley and Emma have read the same amount

Answers

Answer:

Part A)

Ashley will be on the sixth page.

Part B)

[tex]\displaystyle p=\frac{1}{3}m+5[/tex]

Part C)

Six minutes.

Step-by-step explanation:

Ashley is on the first page and she can read one page per minute.

Emma is on the fifth page and she can read one page every three minutes.

Part A)

We can write an equation for Ashley. Let m represent the amount of minutes that has passed.

Since she is already one the first page, our initial value is 1.

She reads one page every minute. So, after m minutes, she would have read m pages.

Therefore, our equation is:

[tex]p=m+1[/tex]

Where p is the total pages read after m minutes.

Then after five minutes, Ashley will be on the:

[tex]p=(5)+1=6[/tex]

Ashley will be on the sixth page after five minutes.

Part B)

Since Emma reads one page every three minutes, we can say that she reads 1/3 of a page every minute.

Since she started on page five, her equation is:

[tex]\displaystyle p=\frac{1}{3}m+5[/tex]

Part C)

So, both of their pages read must be equivalent. Therefore:

[tex]\displaystyle m+1=\frac{1}{3}m+5[/tex]

Solve for m. Subtract 1/3m from both sides:

[tex]\displaystyle \frac{2}{3}m+1=5[/tex]

Subtract 1 from both sides:

[tex]\displaystyle \frac{2}{3}m=4[/tex]

Finally, multiply both sides by 3/2:

[tex]\displaystyle m=4\Big(\frac{3}{2}\Big)=6[/tex]

So, it will take six minutes before Ashley and Emma have read the same number of pages.

I don’t know what to do

Answers

Answer:

okay so, everytime you see anything that says "a number", that will automatically mean that there is a number in the equation that u dont know, so instead of putting a random number in its place, you put an "exponent" aka a letter like "x" for example. so it says, 12 is the sum of a "number" and 3, that means 3 plus a number gives u 12, you would have to make an equation to find the "number" so the equation would be "3 + x = 12".

Step-by-step explanation:

x^4 − 3x^2 − 90 x= -3

Answers

Answer:

-36

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to Right

Step-by-step explanation:

Step 1: Define

x⁴ - 3x² - 90

x = -3

Step 2: Evaluate

Substitute in x:                                                                                                  (-3)⁴ - 3(-3)² - 90Exponents:                                                                                                        81 - 3(9) - 90Multiply:                                                                                                             81 - 27 - 90Subtract:                                                                                                            54 - 90Subtract:                                                                                                            -36

I need help :( on math and I forgot to study!:

When is the additive relationship used? Select all that apply.

1.When subtracting the same amount to an x-value.
2.When dividing the same amount to an x-value.
3.When multiplying the same amount to an x-value.
4.When adding the same amount to an x-value.

Answers

Answer:

3 and 4

Step-by-step explanation:

Answer:

1st and last one just did the question and it was right

Identify all the acute angles in the figure.

Answers

Qvr, Qvs, Svt, Rvs, Tvu, that should be all of them
Acute angle is an angle under 90 degrees

Help please! I asked this question three times and my session is about to start I really need to submit it.
* can you write the answer as a text?
The question will be in the picture (13,16,17,19)

Answers

Answer: 13) 6

I dont know 16 or 17

19) 33

Step-by-step explanation:

A student answered 43 questions correctly in a 53 questions test. What
percent is that?
Round your answer to the nearest whole.
%

Answers

Answer: 81%

Step-by-step explanation: I think i'm right

The Leaning Tower of Pisa makes an 84.5° angle with the ground. 11844.59 What is the supplement to this angle? O 90° 0 95.5 84.5° O 5.5°​

Answers

Answer:

  (b)  95.5°

Step-by-step explanation:

The supplement is found by subtracting the angle measure from 180°.

  180° -84.5° = 95.5° . . . . supplement to given angle

How many solutions does the equation −2a + 2a + 7 = 8 have?

One
Two
None
Infinitely many

Answers

Answer:

None.

Step-by-step explanation:

let's check it

- 2a + 2a + 7 = 8

7≠ 8

So there's no solution for the given equation.

please help me on this question. I forgot how to do it​

Answers

Answer:

141

Step-by-step explanation:

Area of triangle = 24

Area of Trapezoid= 117

117+24

141

Other Questions
The following diagram shows a single cell. Is the cell eukaryotic or prokaryotic? Explain your reasoning What characteristics do all living things share?A: They contain DNAB: They are made up of many partsC: They reproduce by mitosisD: They need oxygen to survive Can someone help me? Ill reward points + brainalist which is not a common multiple of 4 and 9 Plz help me with this plzzzz Tech A says wire size is very important. Tech B says there are two scales used to measure wire size. Who is correct? willl give brainlies if anyone help a sample of a composition with 250-350 words about a visit to a home were you felt unwelcome 1 ptsWhich of the following statements most correctly explains why the genetic code is referred to as a universal code? Question 1 Multiple Choice Worth 3 points)(06.03 MC)The United States today allows competition but also regulates the economy. This suggests that the country uses amarket economytraditional economymixed economycommand economyQuestion 2 Multiple Choice Worth 3 points) Flower diameter in sunflowers is a quantitative trait. A plant with 6-cm flowers, from a highly inbred strain, is crossed to a plant with 30-cm flowers, also from a highly inbred strain. The F1 have 18-cm flowers. F1 F1 crosses yield F2 plants with flowers ranging from 6 to 30 cm in diameter, in approximately 4-cm intervals (6, 10, 14, 18, 22, 26, 30). An 18-cm F1 plant is crossed to a 6-cm plant. What is the probability of an offspring with one additive allele, if all genes that influence this trait are unlinked?a. 1/3b. 1/4c. 1/6d. 3/8e. 1/16 If the circumference of a circle measures 3/2TT cm, what is the area of the circle in terms of TT?A. 3/4 tt cm2B. 9/2 tt cm2C. 9/4 tt cm2D. 9/16 tt cm2 Three boards are placed end to end to make a walkway. The first board is 2 feet 6 inches long, the second board is 3 feet 2 inches long, and the third board is 5eet 7 inches long. How long is the walkway?Write your answer in feet and inches. Use a number less than 12 for inches. This Question: 1 ptportThe type of respirator that has its own clean air supply is theO A. full facepiece maskO B. self-contained breathing apparatusOC. mouthpiece with mechanical filterO D. half maskThis is for a carpentry class the Hsu Manufacturing Company has two service departments: Maintenance and Accounting. The Maintenance Department's costs of $300,000 are allocated on the basis of machine hours. The Accounting Department's costs of $120,000 are allocated on the basis of the number of employees within a specific department. The direct departmental costs for A and B are $300,000 and $500,000, respectively. Maint Acctg A B Machine hours 480 20 2,300 200 Number of employees 2 2 8 4What is the Accounting Department's cost allocated to Department B using the direct method How many moles of caffeine are in 130 mg of caffeine coffee? Part A: What are the Minimum, First Quartile,Median, Third Quartile, and Maximum for thedata? Show your work.64, 53, 60, 60, 56, 58,51, 55, 60 Tall (T) is the dominant allele in pea plants, while short (t) is recessive. Which are the genotypes of a tall plant?Help!!!!! A cheetah, like those shown below at left, and a paramecium, like the one shown below at right, are both living things. According to the cell theory, what can you conclude about these two very different organisms? The others one is the sam thing please help