Question: The parrot effect: how to increase your tips. An experiment examined the relationship between tips and server behavior in a restaurant.32 In one condition, the

The parrot effect: how to increase your tips. An experiment examined the relationship between tips and server behavior in a restaurant.32 In one condition, the server repeated the customer’s order word for word, while in the other condition, the orders were not repeated. Tips were received in 47 of the 60 trials under the repeat condition and in 31 of the 60 trials under the no-repeat condition.

(a) Find the sample proportions and compute a 95% confidence interval for the difference in population proportions.

(b) Use a significance test to compare the two conditions. Summarize the results.

(c) The study was performed in a restaurant in the Netherlands.

Two waitresses performed the tasks. How do these facts relate to the type of conclusions that can be drawn from this study? Do you think that the parrot effect would apply in other countries?

(d) Design a study to test the parrot effect in a setting that is familiar to you. Be sure to include complete details about how the study will be conducted and how you will analyze the results.

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