A researcher is interested in finding a 95% confidence interval for the mean number minutes students are concentrating on their professor during a one hour statistics lecture. The study included 144 students who averaged 37.9 minutes concentrating on their professor during the hour lecture. The standard deviation was 10.4 minutes. Round answers to 3 decimal places where possible. a. To compute the confidence interval use a distribution. b. With 95% confidence the population mean minutes of concentration is between C] and C] minutes. c. If many groups of 144 randomly selected members are studied, then a different confidence interval would be produced from each group. About C] percent of these confidence intervals will contain the true population mean minutes of concentration and about :l percent will not contain the true population mean minutes of concentration