Multiple choice: Select the best answer for Exercises 95 to 102. Does Friday the 13th

QUESTION:

Multiple choice: Select the best answer for Exercises 95 to 102. Does Friday the 13th have an effect on peoples behavior? Researchers collected data on the number of shoppers at a sample of 45 nearby grocery stores on Friday the 6th and Friday the 13th in the same month. The dotplot and computer output below summarize the data on the difference in the number of shoppers at each store on these two days (subtracting in the order 6th minus 13th).25 Diff 800 600 400 200 0 200 N Mean Median TrMean StDev SEMean Min Max Q1 Q3 45 -46.5 -11.0 -37.4 178.0 26.1 -774.0 302.0 -141.0 53.5 Researchers would like to carry out a test of H0 :md = 0 versus Ha :md 0, where md is the true mean difference in the number of grocery shoppers on these two days. Which of the following conditions for performing a paired t test are clearly satisfied? I. Random II. 10% III. Normal/Large Sample (a) I only (c) III only (e) I, II, and III (b) II only (d) I and II only