A manager of a small store wanted to discourage shoplifters by putting signs around the store saying Shoplifting is a crime! However he wanted to make sure this would not result in customers buying less. Totestthis he displayed the signs every other Wednesday for 8 weeks for a total of 4 days displayed. He recorded the stores sales for those four Wednesdays and then recorded the stores sales for the four alternate Wednesdays when the signs were not displayed. On the Wednesdays with the sign the sales were 83 73 81 and 79. On the Wednesdays without the sign sales were 84 90 82 and 84.Do these results suggest that customers buy less when the signs are displayed? (Use the .05 significance level.)a. Use the five steps ofhypothesis testing.b. Sketchthedistributioninvolved.c. Figure the effect size.d. Explain what you did to a person who is familiar with the t test for a single sample but is unfamiliar with the t test for independent means.