Mr. B, the manager at a large retail store, is investigating several variables while measuring the level
Question:
Is the mean number of customers per day affected by the month? Or equivalently, Is the mean number of customers per day the same for all months? versus Is there at least 1 month when the mean number of customers per day is significantly different from the others? The following computer output resulted from analysis of the data.
Inspect the preceding dotplot for number of customers per day for the
12. Months and the ANOVA output for number of customers versus months. Look for evidence that leads to the conclusion Not all months have the same mean number of customers per day.
a. Describe the graphical evidence found and discuss how it shows that not all months are the same. Which month or months appear to be different from the others?
b. Describe the numerical evidence found and discuss how it shows that not all months are the same.
c. Can you tell which months are different based on the numerical evidence? Explain.
d. Does there appear to be any support for the idea that the Thanksgiving to New Years holiday period is the most important sales time of the year? Explain.
e. Use your calculator or computer to perform the ANOVA shown and to verify the results.
Step by Step Answer: