Concept explainers
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
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.
6. A trainer wants to estimate the population mean running times for both male and female runners within 2 minutes. Determine the minimum
- (a) male runners. Assume the population standard deviation is 8.9 minutes.
- (b) female runners. Assume the population standard deviation is 8.4 minutes.
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Elementary Statistics: Picturing the World (6th Edition)
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