answer 30, 31

Question 30 0/5 pts 5 3 2 19 @ Details A fitness center is interested in finding a 95% 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 241 members were looked at and their mean number of visits per week was 2.5 and the standard deviation was 2.6. Round answers to 3 decimal places where possible. a. To compute the confidence interval use a [? v ] distribution. b. With 95% confidence the population mean number of visits per week is between and visits. c. If many groups of 241 randomly selected members are studied, then a different confidence interval would be produced from each group. About percent of these confidence intervals will contain the true population mean number of visits per week and about percent will not contain the true population mean number of visits per week. Submit Question Question 31 0/5 pts 9 3 2 19 0 Details You work for a soft-drink company in the quality control division. You are interested in the standard deviation of one of your production lines as a measure of consistency. The product is intended to have a mean of 12 ounces, and your team would like the standard deviation to be as low as possible. You gather a random sample of 15 containers. Estimate the population standard deviation at a 98% level of confidence. Use 3 decimal places for all answers. 12.19 11.9 12.07 12.16 11.91 12.18 11.91 11.81 11.87 11.94 12.13 11.95 12.02 11.95 12.11 Data checksum: 180.1) a) Find the sample standard deviation: b) Find the lower and upper x" critical values at 98% confidence: Lower: Upper: c) Report your confidence interval for o: (, Submit