The Table Below Shows the Mean Number of Daily Errors

question 6

Multiple Choice

The table below shows the mean number of daily errors by seven 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 have decreased from Week 1 to Week 2. The right-tailed critical value at  = 0.05 is:

• A) 1.895
• B) 1.943
• C) 2.447
• D) 2.365

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