A certified mechanic was timed for the repair of an automobile on 14 separate occarision. over the same period a trainee mechanic was timed for the repair of a similar automobile. The times in minutes are given below. Certified 344 276 257 334 267 164 222 343 212 175 211 311 209 188           Trainee 222 342 178 234 398 232 377 211 309 190 351 343 177 269           b. Test the hypothesis that the two mean times for both mechanics are equal. Use the 5% level of significance.

A certified mechanic was timed for the repair of an automobile on 14 separate occarision. over the same period a trainee mechanic was timed for the repair of a similar automobile. The times in minutes are given below.

Certified 344 276 257 334 267 164 222 343 212
175 211 311 209 188          
Trainee 222 342 178 234 398 232 377 211 309
190 351 343 177 269          

b. Test the hypothesis that the two mean times for both mechanics are equal. Use the 5% level of significance.

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