Is there difference in mean number of defects per shift


The production manager wants to compare the number of defective wheelchairs produced on the day shifts with the number on the afternoon shift. A sample of the production from 6 day shifts and 8 afternoon shifts revealed the following number of defects.

Day 5 8 7 6 9 7
Afternoon 8 10 7 11 9 12 14

At 0.05 significance level, is there a difference in the mean number of defects per shift? Assume that the populations are approximately normally distributed and the variances are equal.

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Basic Statistics: Is there difference in mean number of defects per shift
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