A certified mechanic was timed for the repair of an automobile on 14 separate occasions. Over the same period a trainee mechanic was timed for the repair of a similar automobile. The times in minutes are given below. Certified344276257334267164222343212175211311209188 Trainee222342178234398232377211309190351343177269 b. Test a hypothesis that the two mean times for both mechanics are equal. Use the 5% level of significance. c. Subsequently, it was learnt that the times for the trainee were incorrectly recorded and that each of the values abouve is 30 minutes too small. What, if, any, differences does this make to the results of the test done in part (b)?

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Description: A certified mechanic was timed for the repair of an automobile on 14 separate occasions. Over the same period a trainee mechanic was timed for the repair of a similar automobile. The times in minutes are given below. Certified344276257334267164222343

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A certified mechanic was timed for the repair of an automobile on 14 separate occasions. 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 a hypothesis that the two mean times for both mechanics are equal. Use the 5% level of significance.

c. Subsequently, it was learnt that the times for the trainee were incorrectly recorded and that each of the values abouve is 30 minutes too small. What, if, any, differences does this make to the results of the test done in part (b)?

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