1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
faust18 [17]
3 years ago
10

A running coach wants to know if participating in weekly running clubs significantly improves the time to run a mile. The runnin

g coach collects mean mile times for 42 runners who participate in weekly running clubs with 54 runners who do not run in clubs. The running coach measures times in January and June of the same year. All times are in seconds, and the runners all started with mile times between 8 minutes (480 seconds) and 9 minutes (540 seconds). Here are the results:
January June Change
Mean (seconds) StDev (seconds) Mean (seconds) StDev (seconds) Mean (seconds) StDev (seconds)
Running Club N = 42 530 28 520 23 10 4
Not in a Club N = 54 527 25 519 22 8 3
What is the best method for the running coach to use to determine if participating in weekly running clubs significantly improves the time to run a mile?
A) Use the difference in sample means (530 – 520) in a hypothesis test for a difference in two population means.
B) Use the difference in sample means (10 and 8) in a hypothesis test for a difference in two population means.
C) Use the sample mean 10 in a hypothesis test for a population mean.

Mathematics
1 answer:
patriot [66]3 years ago
7 0

Answer:

Option B is correct.

Use the difference in sample means (10 and 8) in a hypothesis test for a difference in two population means.

Step-by-step Explanation:

The clear, complete table For this question is presented in the attached image to this solution.

It should be noted that For this question, the running coach wants to test if participating in weekly running clubs significantly improves the time to run a mile.

In the data setup, the mean time to run a mile in January for those that participate in weekly running clubs and those that do not was provided.

The mean time to run a mile in June too is provided for those that participate in weekly running clubs and those that do not.

Then the difference in the mean time to run a mile in January and June for the two classes (those that participate in weekly running clubs and those that do not) is also provided.

Since, the aim of the running coach is to test if participating in weekly running clubs significantly improves the time to run a mile, so, it is logical that it is the improvements in running times for the two groups that should be compared.

Hence, we should use the difference in sample means (10 and 8) in a hypothesis test for a difference in two population means.

Hope this Helps!!!

You might be interested in
Question 1(Multiple Choice Worth 5 points) (07.01 MC) The amount of radioactive uranium changes with time. The table below shows
morpeh [17]

the answer would be f(t) = 100(0.25)t

7 0
3 years ago
Read 2 more answers
The height of a trapezoid is 13 yards. One of the bases is 2.5 times theheight, and the other base is two times the height. Find
Levart [38]

Answer:

71.5 I think

Step-by-step explanation:

8 0
3 years ago
A manufacturer has a monthly fixed cost of $40,000 and a production cost of $6.00 for each unit produced. The product sells for
OlgaM077 [116]

Answer:

110 answer hai bro

5 0
3 years ago
WILL GIVE BRAINLIEST!! 2) Match the graph with its function. Which is an example of growth/decay?
Neporo4naja [7]

The exponential growth is: f(x) = 15*(1.25)^x

And its graph is the first one.

The exponential decay is: f(x) = 250*(0.87)^x

And its graph is the second one.

<h3>How to identify the exponential equations?</h3>

The general exponential equation is of the form:

y = A*(b)^x

Where A is the initial value and b is the base.

  • If b > 1, then we have an exponential growth.
  • if 1 > b > 0, then we have an exponential decay.

Here the two functions are:

f(x) = 250*(0.87)^x

f(x) = 15*(1.25)^x

As you can see, the base for the first one is smaller than 1, then it is an exponential decay (and it has a decreasing graph, so the graph of this one is the second graph).

For the second function, we have the base b = 1.25, which is larger than 1, so it is an exponential growth, and its graph is an increasing graph, which is the first one.

If you want to learn more about exponential functions:

brainly.com/question/11464095

#SPJ1

6 0
2 years ago
Thirteen people are entered in a race. If there are no ties, in how many ways can the first three places be awarded?
Leni [432]

Answer:

666.888.000.333

Step-by-step explanation:

yeah I said what I said

bye

5 0
2 years ago
Other questions:
  • I need to know this now
    8·1 answer
  • Yayayaya ummm teehee brain
    11·2 answers
  • Does the point (-4, 3) fall on the graph of this line? How do you know? Show your work. ( 2 points) PLEASE HELP ILL MARK BRAINLI
    10·1 answer
  • How do you prove a parallelogram using these 2 triangles, somebody needs to explain this to me?
    13·1 answer
  • Trent has an 6-foot tall tent in the shape of a square base pyramid with a base length of 14 feet and slant height of 8 feet. If
    15·1 answer
  • a person can pay $9 for a membership to the Science Museum then go to the museum for $1 per visit.For a member of the science mu
    8·1 answer
  • MULTIPLE CHOICE
    12·2 answers
  • 8/9 * 9/8<br><br> multiply it
    15·2 answers
  • Which symbol correctly compares the two fractions?
    12·1 answer
  • What is the slope of the line that passes through the points (8,7) and (4,5)?
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!