I Question 8 v A researcher is interested in finding a 90% confidence interval for the mean number minutes students are concentrating on their professor during a one hour statistics lecture. The study included 139 students who averaged 41.5 minutes concentrating on their professor during the hour lecture. The standard deviation was 11.3 minutes. a. To compute the confidence interval use a distribution. b. With 90% confidence the population mean minutes of concentration is between (round to 3 decimal places)' 'and ' 'minutes. c. If many groups of 139 randomly selected members are studied, then a different confidence interval would be produced from each group. About ' l percent of these confidence intervals will contain the true population mean minutes of concentration and about | ' percent will not contain the true population mean minutes of concentration. Hint: Hints 5' Video 5' Textbook C" Question Help: 8 Message instructor Submit Question 0 Question 9 v You are interested in finding a 95% confidence interval for the average commute that non- residential students have to their college. The data below show the number of commute miles for 13 randomly selected non-residential college students. 7|17|2717 25|20|2618 20 6 212415 a. To compute the confidence interval use a distribution. b. With 95% confidence the population mean commute for non-residential college students is between' land ' 'miles. c. If many groups of 13 randomly selected non-residential college students are surveyed, then a different confidence interval would be produced from each group. Aboutl |percent of these confidence intervals will contain the true population mean number of commute miles and about' ' percent will not contain the true population mean number of commute miles. Hint: Hints 5 Video C Textbook Question Help: 8 Message instructor Submit Question 0 Question 14 v A psychiatrist is interested in finding a 90% confidence interval for the tics per hour exhibited by children with Tourette syndrome. The data below show the tics in an observed hour for 13 randomly selected children with Tourette syndrome. "Elli-MIEIHIIE a. To compute the confidence interval use a distribution. b. With 90% confidence the population mean number of tics per hour that children with Tourette syndrome exhibit is between l 'and l ' days. c. If many groups of 13 randomly selected children with Tourette syndrome are observed, then a different confidence interval would be produced from each group. About ' l percent of these confidence intervals will contain the true population mean number of tics per hour and about' | percent will not contain the true population mean number of tics per hour. Hint: Hints E' Video C" [+]Textbook 5' Question Help: 8 Message instructor