Question

15. 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 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 question marks?

​b) Assume that a recent survey suggests that about 98​% of computers use a new operating system.

N=____

​(Round up to the nearest​ integer.)

16. The brand manager for a brand of toothpaste must plan a campaign designed to increase brand recognition. He wants to first determine the percentage of adults who have heard of the brand. How many adults must he survey in order to be 80​% confident that his estimate is within eight percentage points of the true population​ percentage? Complete parts​ (a) through​ (c) below.

​

​b) Assume that a recent survey suggests that about 87​% of adults have heard of the brand.

N=___

​(Round up to the nearest​ integer.)

Answer 1