In low-speed crash tests of five cars, the repair costs were computed for a factory authorized repair and an independent repair workshop. The results are listed in Table 2. Is there sufficient evidence to support the claim that the independent workshop has lower repair costs? Use a 0.01 significance level. Table 2 car 1

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In low-speed crash tests of five cars, the repair costs were computed for a factory authorized
repair and an independent repair workshop. The results are listed in Table 2. Is there sufficient
evidence to support the claim that the independent workshop has lower repair costs? Use a 0.01
significance level.
Table 2

car 1 2 3 4 5
authorized repair centre X1 RM797 RM571 RM904 RM1147 RM418
independent workshop X2 RM523 RM488 RM875 RM911 RM297
D=X1 - X2 274 83 29 236 121
D2 = (X1 -X2)2 75076 6889 841 55696 14641
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