Question: 3. Tips A pizza delivery driver, always trying to increase tips, runs an experiment on his next 40 deliveries. He flips a coin to decide

3. Tips A pizza delivery driver, always trying to increase tips, runs an experiment on his next 40 deliveries. He flips a coin to decide whether or not to call a customer from his mobile

phone when he is five minutes away, hoping this slight bump in customer service will lead to a slight bump in tips. After 40 deliveries, he will compare the average tip percentage between the customers he called and those he did not. What

are the experimental units and how did he randomize

treatments?

9.Is the experiment of question 3 blind? Can it be double blind? Explain

11.Block that tip The driver of question three wants to know about tipping in general so he recruit several other drivers to participate in the experiment. Each driver randomly decide whether to phone customers before delivery in records for tip percentage. Is this experiment blocked? Is there a good idea?

13. Confounded tips for the experiment of question 3, name some confounding variables that might influence experiments results.

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