A study was conducted to determine whether automobile repair charges are higher for female customers than for male customers. Twenty auto repair shops were randomly selected from the telephone book. Two cars of the same age, brand, and engine problem were used in the study. For each repair shop, the two cars were randomly assigned to a man and woman participant and then taken to the shop for an estimate of repair cost. The repair costs (in dollars) are given in data 4. Which procedure, t or Wilcoxon, is more appropriate in this situation? Why? Are repair costs generally higher for female customers than for male customers? data4 'RepairShop' 'Female' 'Male' 1 871 792 2 684 765 3 795 511
A study was conducted to determine whether automobile repair charges are higher for female customers than for male customers. Twenty auto repair shops were randomly selected from the telephone book. Two cars of the same age, brand, and engine problem were used in the study. For each repair shop, the two cars were randomly assigned to a man and woman participant and then taken to the shop for an estimate of repair cost. The repair costs (in dollars) are given in data 4. Which procedure, t or Wilcoxon, is more appropriate in this situation? Why? Are repair costs generally higher for female customers than for male customers?
data4
'RepairShop' 'Female' 'Male'
1 871 792
2 684 765
3 795 511
4 838 520
5 1033 618
6 917 447
7 1047 548
8 723 720
9 1179 899
10 707 788
11 817 927
12 846 657
13 975 851
14 868 702
15 1323 918
16 791 528
17 1157 884
18 932 702
19 1089 839
20 770 878
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