9.17 To tip or not to tip.
A study of tipping behaviors examined the relationship between the color of the shirt worn by the server and whether or not the customer left a tip.8 Here are the data for 418 male customers who participated in the study.
tipmale
Shirt color | ||||||
---|---|---|---|---|---|---|
Tip | Black | White | Red | Yellow | Blue | Green |
Yes | 22 | 25 | 40 | 31 | 25 | 27 |
No | 49 | 43 | 29 | 41 | 42 | 43 |
9.17
(a) Answers will vary. The percent that tip for each shirt color are Black 30.99%, White 36.76%, Red 57.97%, Yellow 43.06%, Blue 37.31%, Green 38.57%.
(b) There is no association between whether a male customer tips and shirt color of the server. There is an association between whether a male customer tips and shirt color of the server.
(c) .
(e) The data provide evidence of an association between whether or not the male customer left a tip and shirt color worn by the server. Red-shirted servers got the most tips!