The head librarian at the Library of Congress has asked her assistant for an interval estimate of the mean number of books checked out each day. The assistant provides the following interval estimate: from 740 to 920 books per day. What is an efficient, unbiased point estimate of the number of books checked out each day at the Library of Congress?
A) 1,660
B) 920
C) 740
D) 830

Question

Quizplus · Accepted Answer

An efficient, unbiased point estimate would be the midpoint of the interval estimate provided by the assistant, which is (740 + 920)/2 = 830 books per day. Therefore, the best choice is D.

The Head Librarian at the Library of Congress Has Asked