Question

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 a = 0.1 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. Student 1 2 3 4 5 6 7 Score on first SAT 590 370 400 360 440 580 360 Score on second SAT 620 420 470 480 460 610 410 Copy Data Step 1 of 5: State the null and alternative hypotheses for the test. Answer Point Tables Keypad Houd 0 Hawa 0

Answer 1

Second SAT- -70 -120 US Step 3: The test stati the t= a-ud d=(betor prep course) - (atter prep Cource) First SAT d: -30 -BIO azada = -528511 = -52.86 Steps: Ho: Mago Ha: Marko Step2 : The Standard deviation sa = (- (22) Sa28500 - (-37012) 134.0 21-4:13 (Selva) (347) Step 4: At azol and dt-6 -1.440. Reject to it ---52.86-0 Steps Reject Null hypothesis