Question

A researcher is interested in finding a 98% confidence interval for the mean number minutes students are concentrating on their professor during a one hour statistics lecture. The study included 138 students who averaged 32.5 minutes concentrating on their professor during the hour lecture. The standard deviation was 10.8 minutes.

a. To compute the confidence interval use a distribution.

b. With 98% confidence the population mean minutes of concentration is between answer ____ and answer _____ minutes.

c. If many groups of 138 randomly selected members are studied, then a different confidence interval would be produced from each group. About answer ____ percent of these confidence intervals will contain the true population mean minutes of concentration and about answer ____ percent will not contain the true population mean minutes of concentration.

Answer 1