The Table Below Shows the Mean Number of Daily Errors

question 8

Multiple Choice

The table below shows the mean number of daily errors by air traffic controller trainees during the first two weeks on the job.We want to perform a paired t-test at  = .05 to see if the mean daily errors decreased significantly. The test statistic is:

• A) 1.25
• B) 1.75
• C) 0.87
• D) 0.79

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