# S O C A random sample of 429 college students was interviewed about a number of matters. Use the results to construct confidence interval estimates of the population mean at the 99% level. a. They reported that they had spent an average of $478.23 on textbooks during the previous semester, with a sample standard deviation of$ 15.78 . b. They also reported that they had visited the health clinic an average of 1.5 times a semester, with a sample standard deviation of 0.3. c. On the average, the sample had missed 2.8 days of classes per semester because of illness, with a sample standard deviation of 1.0. d. On the average, the sample had missed 3.5 days of classes per semester for reasons other than illness, with a sample standard deviation of 1.5.

### Essentials Of Statistics

4th Edition
HEALEY + 1 other
Publisher: Cengage Learning,
ISBN: 9781305093836

### Essentials Of Statistics

4th Edition
HEALEY + 1 other
Publisher: Cengage Learning,
ISBN: 9781305093836

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Chapter 6, Problem 6.7P
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