Need help with B

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 98 students who averaged 34.5 minutes concentrating on their professor during the hour lecture. The standard deviation was 12.3 minutes. Round answers to 3 decimal places where possible. a. To compute the confidence interval use a t v . distribution. b. With 95% confidence the population mean minutes of concentration is between and minutes. c. If many groups of 98 randomly selected members are studied, then a different confidence interval would be produced from each group. About 95 percent of these confidence intervals will contain the true population mean minutes of concentration and about 5 percent will not contain the true population mean minutes of concentration. Question Help: 9 Written Example Message instructor