Many retail establishments use mystery shoppers to provide managers with feedback on how well their service employees perform. A mystery shopper is a person who is hired to pose as a typical customer and complete a report that rates various aspects of their shopping experience.

The following table shows mystery shopper ratings for cleanliness of 3 retail stores on a scale of 1-20. Consider the shoppers as blocks and each store they visit as the different treatments.

Find the mean of the block for shopper #1.

| Shopper | Walmart | Starbucks | The Gap |
|---------|---------|-----------|---------|
| 1 | 12 | 17 | 13 |
| 2 | 16 | 18 | 17 |
| 3 | 14 | 17 | 17 |
| 4 | 18 | 20 | 19 |

(Note: This data corresponds with worksheet tab, Q17, in the Exam 2 Excel file in Canvas. You will use this table for Q17-Q23.)

In order to calculate the mean score of the block for shopper #1, we need to find the sum of the ratings for all three stores and then divide them by the number of stores. For shopper #1, the ratings were 12 for Walmart, 17 for Starbucks, and 13 for The Gap. So, the mean can be calculated as:

Mean = (Walmart + Starbucks + The Gap) / Number of Stores

Mean = (12 + 17 + 13) / 3 = 14

So, the mean rating for shopper #1 is 14.

Learn more about Mean here:

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