You plan to select a simple random sample in order to estimate the average course load for freshman students at Brighton College. From the freshman class of 1600, you randomly choose 16 students, with the following results: sample mean = 16.2 credit hours, sample standard deviation = 5.3 credit hours. Construct a 95% confidence interval estimate of the class average. As you proceed, decide which of the following you should be using
a. The t distribution .
b. An assumption that the population distribution here is approximately normal.
c. Division by n –1 rather than n.