8.63 Significance test for tipping
Refer to the previous two exercises.
8.63
(a) . For male customers, the percent who tip a red-shirted server is the same as the percent who tip a different-colored-shirt server. (b) Answers will vary. . For male customers, the percent who tip a red-shirted server is higher than the percent who tip a different-coloredshirt server. Because the color red was singled out, it is logical that we might expect it to have higher percent of tips. (Note: is also acceptable with a suitable argument.) (c) Yes, we have at least 10 successes and failures in each sample.