Performance Ratings A manufacturing plant wants to determine whether its manager performance rating ...

In Exercise #20, (a) identify the claim and state Ho and Ha, (b) find the critical value (s) and identify the rejection region(s), ( c) calculate d and s , (d) use the t-test to find the standardized test statistic t, (e) decide whether to reject or fail to reject the null hypothesis, and (f) interpret the decision in the context of the original claim. For each randomly selected sample, assume the distribution of the population is normal.
Performance Ratings A manufacturing plant wants to determine whether its manager performance rating (0 – 100 ) have changed from the last month to this month. The table shows the plant's performance rating from the same six managers for last month and this month. At a =a0.05, it there enough evidence to conclude that the plan's performance rating have changed?
Manager 1 2 3 4 5 6
Raging (last month) 85 96 70 76 81 78
Rating (this month) 88 85 89 86 92 89