Mr. B, the manager of the retail store in Exercise 12. .44, has seen that the mean number of customers per day varies by month, and he is now wondering if month has a similar effect on number of items purchased.
a. Do you think “month” has an effect on the mean number of items purchased per day? Equivalently, do you think the mean number of items purchased per day is the same for all months? If not, which months do you believe are different? Explain.
b. Construct a dotplot for the number of items purchased per day for each different month.
c. Does the dotplot in part b support your conjectures in part a? Explain.
d. Use the ANOVA technique to answer the question, “Does month affect the mean number of items purchased per day?” Use  = 0.05.
e. Explain any differences and similarities between your answer in part a and the answer found in d.