Question

When establishing the confidence interval for the average weight of a cereal box, assume that the population standard deviation is known to be 2 ounces. Based on a sample, the average weight of a sample of 20 boxes is 16 ounces. The appropriate test statistics to use is ________.A) pB) tC) zD) χ

Answer 1

Option C) z-statistic

Explanation:

We are given the following information:

We have to establish confidence interval for the average weight of a cereal box.

Sample size = 20

Sample mean = 16 ounces

Population standard Deviation = 2 ounces

We have to decide the appropriate test statistic.

We use z-statistic for approximation whenever the population standard deviation is given.

Thus appropriate test statistic to establish confidence interval is z-statistic.