[EX09-152] Getting a college education today is almost as important as breathing and it’s expensive!

It is not just the tuition, room, and board;

textbooks are expensive too. It is very important for students, and their parents, to have an accurate estimate of total textbook costs. The total cost of required textbooks for nine freshman- or sophomore-level classes at 10 randomly selected New York public colleges was collected: 582.19 806.40 913.44 915.75 932.35 957.45 960.92 996.24 1070.44 1223.44

a. Construct a histogram and find the mean and standard deviation.

b. Demonstrate how this set of data satisfies the assumptions for inference.

c. Find the 95% confidence interval for , the mean total cost of required textbooks.

d. Interpret the meaning of the confidence interval.