An instructor has an afternoon class and an evening class. After an exam the instructor thinks that the evening class has done better on average than the afternoon class. From the dataset ECONOMICS TEST SCORES (evening class column 1 and afternoon class column 2) determine if the instructor is correct. If you use StatDisk use the recommended method. Assume no outliers.
a. Set up two boxplots to test the two means.
b. Are the two means OBVIOUSLY different.
c. If not do a hypothesis test at 95% confidence level.
i. State the null and alternative hypothesis
ii. Set up z or t distribution with critical value.
d. Are the means statistically different?
e. Print the results along with the plot.