A company that sells an online course aimed at helping high-school students impr

Question

A company that sells an online course aimed at helping high-school students improve their SAT scores has claimed that SAT scores will improve by more than 92 points on average if students successfully complete the course. To test this, a national school counseling organization plans to select a random sample of n = 100 students who have previously taken the SAT test. These students will take the company's course and then retake the SAT test. Assuming that the population standard deviation for improvement in test scores is thought to be 30 points and the level of significance for the hypothesis test is 0.05, find the critical value in terms of improvement in SAT points.

A. Reject the null if SAT improvement is > 96.935 points.

Explanation / Answer

Answer to the folllowing question:
92+/- 1.96*30/sqrt(100)
=86.12 to 97.88
So, outside these CI boundries we reject null hypothesis
Therefore, we say option A is right

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