Question

Mr. B, the manager at a large retail store, is investigating several variables while measuring the level of his business. His store is open every day during the year except for New Year’s Day, Christmas, and all Sundays. From his records, which cover several years prior, Mr. B has randomly identified 62 days and collected data for the daily total of three variables: number of paying customers, number of items purchased, and total cost of items purchased.

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 Year’s 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.


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  • CreatedAugust 28, 2015
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