Select one answer A running coach wants to know if participating in weekly runni

Question

Select one answer A running coach wants to know if participating in weekly running clubs significantly improves the time to run a mile. The running coach collects mean io points mile times for 42 runners who participate in weekly running clubs with 54 runners who do not run in clubs. The 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: running coach measures times in January and June of the same Change January Mean (seconds) (seconds) (seconds) (seconds) (seconds) (seconds) June StDev Mean StDev Mean StDev Running Club 530 28 520 23 10 4 Not in a Club N 527 25 519 8 3 The running coach conducts a hypothesis test and finds that running club members significantly improve their running times with a p-value

Explanation / Answer

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

Option- (D)

2) We are 90% confident that between 3% and 13% of students will improve their SAT scores after taking PrepIt! This is not very impressive, as we can see by looking at the small p-value.

Option- (C)

3) Use the difference in sample means (500 - 529) in a hypothesis test for a difference in two population means

Option- (B)

Related Questions

Navigate

• Browse (All)
• Browse S
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.