Question

Student

1

2

3

4

5

6

7

Score on first SAT

530

410

380

600

480

440

380

Score on second SAT

560

460

400

620

500

520

430

An SAT prep course claims to improve the test score of students. The table below shows the scores for seven students the first two times they took the verbal SAT. Before taking the SAT for the second time, each student took a course to try to improve his or her verbal SAT scores. Do these results support the claim that the SAT prep course improves the students' verbal SAT scores?

Let d=(verbal SAT scores prior to taking the prep course)−(verbal SAT scores after taking the prep course). Use a significance level of α=0.01 for the test. Assume that the verbal SAT scores are normally distributed for the population of students both before and after taking the SAT prep course.

Step 1 of 5: State the null and alternative hypotheses for the test.

Step 2 of 5: Find the value of the standard deviation of the paired differences. Round your answer to one decimal place.

Step 3 of 5: Compute the value of the test statistic. Round your answer to three decimal places

step 4 of 5: Determine the decision rule for rejecting the null hypothesis H0. Round the numerical portion of your answer to three decimal places.

Step 5 of 5: Make the decision for the hypothesis test.

Answer 1

step 1":

null Hypothesis:μd		>=	0
alternate Hypothesis: μd		<	0

Step 2 of 5: standard deviation of the paired differences =22.7

Step 3 of 5: Compute the value of the test statistic =-4.500

step 4 of 5:

Decision rule: reject Ho if test statistic t<-3.143

step 5:

reject the null hypothesis