Question

A programmer plans to develop a new software system. In planning for the operating system that he will use, he needs to estimate the percentage of computers that the use a new operating system. How many computers must be surveyed in order to be 95% confident that his estimate is in error by no more than two percentage points?

a. Assume that nothing is known about the percentage of computers with new operating systems.

b. Assume that a recent survey suggest that about 93% of the computers use a new operating system?

c. Does the additional survey information from part (b) have much of an effect on the sample size that is required?

Answer 1