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To Do Now After 6.1 To Do Now After 6.1 1. Julia enjoys jogging. She has been jogging over a period of several years, during which time her physical condition remained constantly good. Usually, she jogs 2 miles per day. During the past year Julia has sometimes recorded her time to run 2 miles. She has a sample of 90 of these times. For these 90 times, the mean was 15.60 minutes and the standard deviation was 1.80 minutes. Let be the mean jogging time for the entire distribution of her running times taken over the past year. Find a 95% confidence interval for . 1. Julia enjoys jogging. She has been jogging over a period of several years, during which time her physical condition remained constantly good. Usually, she jogs 2 miles per day. During the past year Julia has sometimes recorded her time to run 2 miles. She has a sample of 90 of these times. For these 90 times, the mean was 15.60 minutes and the standard deviation was 1.80 minutes. Let be the mean jogging time for the entire distribution of her running times taken over the past year. Find a 95% confidence interval for . 2. Walter usually meets Julia at the track. He prefers to jog 3 miles. While Julia kept her record, he also kept his own. For his 90 times, the mean was 22.50 minutes and the standard deviation was 2.40 minutes. Let be the mean jogging time for the entire distribution of his running times over the past several years. Find a 99% confidence interval for . 2. Walter usually meets Julia at the track. He prefers to jog 3 miles. While Julia kept her record, he also kept his own. For his 90 times, the mean was 22.50 minutes and the standard deviation was 2.40 minutes. Let be the mean jogging time for the entire distribution of his running times over the past several years. Find a 99% confidence interval for .