Show transcribed image text Last year i It took students and average of 80 minutes to finish the final exam. Suppose the average time a sample of 20 students takes to finish this year's final exam has a mean of 85 minutes and standard deviation of 15. We see that a histogram of the data shows no signs of skewness and a BoxPlot shows no outliers. We want to run a hypothesis test to see if this years exam is significantly longer than last year's. (use a-0.01) What Critical Value should we use? O 1.96 2.539 2.861 O 2.575
Last year i It took students and average of 80 minutes to finish the final exam. Suppose the average time a sample of 20 students takes to finish this year's final exam has a mean of 85 minutes and standard deviation of 15. We see that a histogram of the data shows no signs of skewness and a BoxPlot shows no outliers. We want to run a hypothesis test to see if this years exam is significantly longer than last year's. (use a-0.01) What Critical Value should we use? O 1.96 2.539 2.861 O 2.575
