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 $\alpha$ = .05 to see if the mean daily errors have decreased from Week 1 to Week 2. The right-tailed critical value at $\alpha$ = 0.05 is:
A) 1.895
B) 1.943
C) 2.447
D) 2.365

Question

Quizplus · Accepted Answer

We need to find the critical value for a right-tailed paired t-test at F1F1F1S1F1F1F10 = 0.05 with 6 degrees of freedom (n-1=7-1). Using a t-distribution table or a calculator, we find the critical value to be 1.943. Therefore, the correct answer is B.

The Table Below Shows the Mean Number of Daily Errors α\alphaα

The Table Below Shows the Mean Number of Daily Errors $\alpha$