7. A fitness center is interested in finding a 90% confidence interval for the mean number of days per week that Americans who are members of a fitness club go to their fitness center. Records of 257 members were looked at and their mean number of visits per week was 2.8 and the standard deviation was 1.8. Round answers to 3 decimal places where possible. earch a. a Fill in the blank: To compute the confidence interval use distribution. b. ) With 90% confidence the population mean number of visits per and week is between visits. , If many groups of 257 randomly selected members are studied, then a different confidence interval would be produced from each group. About 90 percent of these confidence intervals will contain the true population percent will not contain mean number of visits per week and about the true population mean number of visits per week. 10

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