l- :5, 1' 1 ET 0 Question 21 v D B on pt 0 2 CD Details A researcher is interested in finding a 90% condence interval for the mean number minutes mcernents students are concentrating on their professor during a one hour statistics lecture. The study included 118 students who averaged 38.1 minutes concentrating on their professor during the nments hour lecture. The standard deviation was 13.6 minutes. Round answers to 3 decimal places issions where possible. ' a. To compute the confidence interval use a distribution. es b. With 90% confidence the population mean minutes of concentration is between [:1 do and E minutes. as c. if many groups of 118 randomly selected members are studied, then a different confidence 5 interval would be produced from each group. About [:] percent of these confidence iabus intervals will contain the true population mean minutes of concentration and about :3 >dules percent will not contain the true population mean minutes of concentration. ngle Drive fflce 365 \" :udent Course