Practice problems:

The test scores for all seniors taking history have a mean score of 74.4.One randomly selected section of the history class had the following test results:

91, 68, 74, 78, 61, 72, 78, 81, 84, 93, 70, 75, 80, 88, 96

Did students in this section scoresignificantly betteron the test?Let= 0.05 and complete the following steps.

1.Identity the random variable and the parameter in words.

2.

Null hypothesis =

Alternative hypothesis:

3.Collect sample statistics.

4.Identify the type of hypothesis test.

5.State and testthe assumptions for this test.

6.Calculate the test statistic, showing your work.

7.Determine p with work.

8.State your decision (results) about the hypothesis in words.

9.State your conclusion (interpretation) about the real-life situation in words.

If your conclusion is incorrect, what type of error did you make?Explain.