One rejects the null hypothesis only when:
A) the sample mean is larger than the population mean.
B) the p value associated with the test statistic is smaller than the p level chosen.
C) the sample mean is smaller than the population mean.
D) the p value associated with the test statistic is greater than the p level chosen.

Question

Quizplus · Accepted Answer

The decision to reject the null hypothesis is based on the p value associated with the test statistic. If the p value is smaller than the pre-determined significance level (p level), typically set at 0.05 or 0.01, then the null hypothesis is rejected in favor of the alternative hypothesis. A smaller p value means stronger evidence against the null hypothesis. Choosing a larger p level will make it easier to reject the null hypothesis, while choosing a smaller p level will make it more difficult. Therefore, the correct choice is B.

One Rejects the Null Hypothesis Only When