Elementary Statistics 7th.ed. Instructor's Review Copy

7th Edition

ISBN: 9780134683584

Author: Larson

Publisher: PEARSON

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Textbook Question

Chapter 6.2, Problem 2CS

A marathon is a fool race with a distance of 26.22 miles. It was one of the original events of the modem Olympics, where it was a men’s only event. The women’s marathon became an Olympic event in 1984. The Olympic record for the men’s marathon was set during the 2008 Olympics by Samuel Kamau Wanjiru of Kenya, with a time of 2 hours, 6 minutes, 32 seconds. The Olympic record for the women’s marathon was set during the 2012 Olympics by Tiki Gelana of Ethiopa, with a time of 2 hours. 23 minutes, 7 seconds.

Training for a marathon typically lasts at least 6 months. The training is gradual, with increases in distance about every 2 weeks. About 1 to 3 weeks before the race, the distance run is decreased slightly. The stem-and-leaf plots below show the marathon training times (in minutes) for a random sample of 30 male runners and 30 female runners.

Chapter 6.2, Problem 2CS, A marathon is a fool race with a distance of 26.22 miles. It was one of the original events of the

2. Find the sample standard deviation of the training times for the

(a) male runners.
(b) female runners.

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Chapter 6.2, Problem 1CS

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Chapter 6 Solutions

Elementary Statistics 7th.ed. Instructor's Review Copy

Ch. 6.1 - In Example 1, the researcher selects a second...Ch. 6.1 - Use the data in Try It Yourself 1 and a 95%...Ch. 6.1 - Use the data in Try It Yourself 1 to construct a...Ch. 6.1 - Use the data in Example 1 and technology to...Ch. 6.1 - Construct a 90% confidence interval for the...Ch. 6.1 - In Example 6, how many student-athletes must the...Ch. 6.1 - When estimating a population mean, are you more...Ch. 6.1 - Which statistic is the best unbiased estimator for...Ch. 6.1 - For the same sample statistics, which level of...Ch. 6.1 - You construct a 95% confidence interval for a...

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