You want to run a difference-in-difference experiment with a price increase for the bacon cheeseburger item on your menu. If you are worried about the "representativeness" with your control group, a poor comparison menu item would be a. soft drink sales b. the bacon-lettuce-and-tomato sandwich c. the regular cheeseburger d. the bacon burger without cheese

A

Explanation:

A soft drink will definitely be a poor comparison menu because it initially started the experiment with a bacon cheeseburger. From the experiment, it doesn't correlate with the representativeness.

a. soft drink sales

Explanation: A poor comparison item would be the soft drink sales. For a sample unit to be representative, all of the elements in a population should have the same chance to be part of the larger sample. A representative sample is a subset of a population that seeks to accurately reflect the characteristics of the larger group. All other options are in a way similar to the bacon cheeseburger except soft drink sales. Therefore it is not representative of the whole.

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