Question

A company selects a random sample of 75 employees and records the proportion of employees who have been with the company for at least 10 years. A 95% confidence interval for the true proportion was computed to be (0.18, 0.23).

If the company wants to cut its margin of error in half, how many employees should it survey? ⇒ 300

Answer 1

Answer: 300

Explanation:

Increasing the sample size by a factor of 4 will cut the margin of error in half.

Always multiply the original sample by 4 if we have a type of question like this. Therefore, 75x4= 300.

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Answer 2

300

Explanation:

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