Question: Testing Claims In Exercises 15–24, (a) write the claim mathematically and identify and (b) find the critical value(s) and identify the rejection region(s), (c) use the test to find the standardized test statistic, (d) decide whether to reject or fail to reject the null hypothesis, and (e) interpret the decision in the context of the original claim. For each claim, assume the population is normally distributed.

Physical Science Assessment Tests On a physical science assessment test, the scores of a random sample of 22 eighth grade students have a standard deviation of 27.7. This result prompts a test administrator to claim that the standard deviation for eighth graders on the examination is less than 29.At

is there enough evidence to support the administrator’s claim?

(Adapted from National Center for Educational Statistics)