A local business offers test-taking courses for students who are planning to take the Graduate Record Examination (GRE) as part of their graduate school applications. The business promises to produce...

A local business offers test-taking courses for students who are planning to take the Graduate Record Examination (GRE) as part of their graduate school applications. The business promises to produce student test scores that are above the national average. You collect a random sample of 75 local students who have taken the course and calculate that their average GRE score is 1630 with a standard deviation of 320. The average GRE score for all students in the nation is 1590.

Conduct a significance test at a=.05 to answer the research question: Does the course significantly improve local student GRE scores?

STEP ONE:

What are the test requirements/assumptions for this significance test? Check all that apply.