Below are matched pair data consisting of customer service scores for a sample of 12 employees before and after they watched an instructional video on their company's mission statement. At a 0.2 significance level, use the sign test to test the claim that viewing the instructional video affects the employees' customer service scores. Before 61 51 78 57 73 52 56 76 57 76 76 64 After 65 55 78 60 75 57 52 75 57 75 81 63 (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 affects customer service scores. There is not sufficient evidence to support the claim that the video affects customer service scores. O There is sufficient evidence to warrant rejection of the claim that the video affects customer service scores. There is sufficient evidence to support the claim that the video affects customer service scores. Submit