MATH 1040 - Introduction to Statistics

3.1 Observational Studies - Solution for Practice 3

What is the most popular brand of car? You want to know which make of car is most popular in the area. So, you gather data from car dealerships in the area.

Potential Problems to candidate support observational study

Not all cars are sold in dealerships.

The state of the economy may also influence how people buy cars

Also, buyers of used cars may not be as particular about the make of car they buy.

Potential Solutions to candidate support observational study

Collect information on the following variables:

• Make of car
• Date of purchase (to compare with economic conditions)
• Was the car used or new
• Sold by dealership or sold by individual

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