A teacher gives a test to her classes before and after showing them a particular educational video. A random sample of 1? of these students is selected. It was found that ? 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 0.02 significance level will be used to test the claim that the video affects students' test scores. {a} What is the value of the test statistic used in this sign test? l l [b] What is the critical value in this sign test?| I [c] What is the correct conclusion of this sign test? '1} There is sufficient evidence to warrant rejection of the claim that the video affects students' test scores. '33} There is not sufficient evidence to warrant rejection of the claim that the video affects students' test scores. '33:? There is sufficient evidence to support the claim that the video affects students' test scores. '33} There is not sufficient evidence to support the claim that the video affects students' test scores