Question

A teacher gives a test to her classes before and after showing them a particular educational video. A random sample of 15 of these students is selected. It was found that 5 of these students had a higher post- video test score, 9 of them had a lower post-video test score, and 1 student had equal pre- and post-video test scores. The sign test at the 0.2 significance level will be used to test the claim that the video does not affect students' test scores. (a) What is the value of the test statistic used in this sign test? (b) What is the critical value in this sign test? (c) What is the correct conclusion of this sign test? There is not sufficient evidence to warrant rejection of the claim that the video does not affect students' test scores. There is not sufficient evidence to support the claim that the video does not affect students' test scores. There is sufficient evidence to warrant rejection of the claim that the video does not affect students' test scores. There is sufficient evidence to support the claim that the video does not affect students' test scores. Submit Question

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Answer 1

5 tue sign Ho: Mo =0 -claim He: loto -vesign=9 I have no effect to tell = 15 (a) test steetis tics, = min (tve sign, -vesign) Emin (5,9) 5 (b) For n = 5+9 = 14 Cet 0.05 level, 12 critical value of sign tes+= here x=5> x=2 :. There is sufficient evidence to support the claim that video does not affect student's test scores. CS Scanned with CamScanner