Question

The manager of a department store wants to determine what proportion of people who enter the store use the store's credit card for their purchases. What size sample should he take so that at 99% confidence the error will not be more than 8%?

Answer 1

D. 260

Explanation:

Given that

Confidence interval = 99%

Not more than 8%

Based on the above information,

The size of the sample that should be considered is

= .25 ÷ (.08 ÷ 2.58)^2

After solving this,

The sample size is 260 and the same is to be considered

hence, the correct option is D. 260

therefore all the other options are wrong