Estimates of Ease of Reading Refer to Data Set 14 for the Flesch-Kincaid Grade Level ratings for 12 randomly selected pages taken from books by Tom Clancy, J. K.

Rowling, and Leo Tolstoy.

a. Construct a 95% confidence interval estimate of the mean Flesch-Kincaid Grade Level rating for the population of all pages from The Bear and the Dragon by Tom Clancy.

b. Construct a 95% confidence interval estimate of the mean Flesch-Kincaid Grade Level rating for the population of all pages from Harry Potter and the Sorcerer’s Stone by J. K. Rowling.

c. Construct a 95% confidence interval estimate of the mean Flesch-Kincaid Grade Level rating for the population of all pages from War and Peace by Leo Tolstoy.

d. Compare the preceding confidence intervals. What do you conclude about the grade level readability ratings?