Chapter 8 Confidence Intervals (Mean) Score: 3/14 3/14 answered Progress saved Done Question 7 0/1 pt 9 3 2 A fitness center is interested in finding a 98% 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 268 members were looked at and their mean number of visits per week was 2.4 and the standard deviation was 1.8. Round answers to 3 decimal places where possible. a. To compute the confidence interval use a |? ~| distribution. b. With 98% confidence the population mean number of visits per week is between and visits . c. If many groups of 268 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. Hint: Hints Video ) [+] Question Help: Message instructor W Rain.. ~ 9 6 0 61 O 1 12 prt'sc delete 141 10 & % 9 5 PChapter 8 Confidence Intervals (Mean) om/courses/26867/assignments/742918?module_item_id=2191132 Chapter 8 Confidence Intervals (Mean) Progress saved Done Score: 3/14 3/14 answered B G Question 8 0/1 pt 0 3 The mayor is interested in finding a 90% confidence interval for the mean number of pounds of trash per person per week that is generated in city. The study included 248 residents whose mean number of pounds of trash generated per person per week was 34.4 pounds and the standard deviation was 8.7 pounds. a. To compute the confidence interval use a |?~| distribution. b. With 90% confidence the population mean number of pounds per person per week is between and pounds. c. If many groups of 248 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 pounds of trash generated per person per week and about percent will not contain the true population mean number of pounds of trash generated per person per week. Hint: Hints Video Textbook Question Help: ) Message instructor O #SOEW Rain. hp 12 prt sc delete 10 144 & 5 9com/courses/2686//assignm Progress saved Done Score: 3/14 3/14 answered Question 9 0/1 A fitness center is interested in finding a 98% 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 222 members were looked at and their mean number of visits per week was 3.3 and the standard deviation was 1.7. a. To compute the confidence interval use a |? v | distribution. b. With 98% confidence the population mean number of visits per week is between and visits . c. If many groups of 222 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. Hint: Hints Video Textbook Question Help: Message instructor O w Rain... prt so delet 18 19 144 &