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)t
B)z
C)χ
D)p

Question

Quizplus · Accepted Answer

The appropriate test statistic to use is a z-test, since the population standard deviation is known and the sample size is greater than 30. A t-test is used when the population standard deviation is unknown and the sample size is small (less than 30). A chi-square test is used for categorical data, and p-value is a measure of the strength of evidence against the null hypothesis.

When Establishing the Confidence Interval for the Average Weight of a Cereal