A researcher gathers a random sample of people to see if a new test-taking strategy will change scores on class exams. She chooses an SAT mathematics exam and gives it to a set of test-takers. During the next week, the researcher hosts test-taking strategy seminars that all of the test takers attend. The same people then take a highly similar SAT exam. The average difference between the pre- and post-tests was a 6-point increase from Time 1 to Time 2. The researcher used an (alpha) = .05. The inferential test-statistic (the calculated result) was: t(999) = 13.49, p < .05.

options

She should conclude that the null has been proved.

She should reject the null hypothesis.

She should retain the null hypothesis.

She doesn't have enough information to answer this question.