Suppose That an Internal Report Submitted to the Managers at a Bank

Multiple Choice

Suppose that an internal report submitted to the managers at a bank in Boston showed that with 95 percent confidence, the proportion of the bank's customers who also have accounts at one or more other banks is between .45 and .51. Given this information, what sample size was used to arrive at this estimate?

A) About 344
B) Approximately 1,066
C) Just under 700
D) Can't be determined without more information.