Question

A pizza delivery driver, always trying to increase tips, runs an experiment on his next 90 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 90 deliveries, he will compare the average tip percentage between the customers he called and those he did not.

c) What kind of sampling method could you deduce was being used.

d) What are the experimental units and how did he randomize treatments?

Answer 1

c)

The sampling method used by the pizza delivery driver was convenience sampling since he (out of his convenience) chose the next 90 deliveries to be included in the sample, as they were easy for him to sample.

d)

The experimental units here are the 90 customers whose pizza was delivered by the pizza delivery guy as these were the customers on which the pizza delivery guy ran the experiment.

He randomized treatments using simple randomization since each experimental unit is assigned to one of the two groups independently of other experimental units.

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