Many librarians rely on book reviews to determine which new books to purchase for their library. A random sample of 375 book reviews in American history, geography, and area studies was selected and the "overall opinion" of the book stated in each review was ascertained

(Library Acquisitions: Practice and Theory, Vol. 19,1995).

Overall opinion was coded as follows: 1 = would not recommend, 2 = cautious or very little recommendation, 3 = little or no preference, 4 = favorable/recommended, 5 = outstanding/significant contribution. A summary of the data is provided in the bar graph.

a. Interpret the bar graph.

b. Comment on the following statement extracted from the study: "A majority (more than 75%) of books reviewed are evaluated favorably and recommended for purchase."