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Chapter 1: Q27 (page 11)

What’s Wrong? In Exercises 25–28, identify what is wrong.

Motorcycles and Sour Cream: In recent years, there has been a strong correlation between the per capita consumption of sour cream and the number of motorcycle riders killed in non-collision accidents. Therefore, consumption of sour cream causes motorcycle fatalities.

Short Answer

Expert verified

Correlation cannot assure the cause of the relationship.

Step by step solution

01

Given information

Two variables are strongly correlated:

  • Per capita consumption of sour cream
  • Motorcycle riders killed in non-collision accidents
02

Correlation interpretation

Two strongly correlated variables show a very strong linear pattern of association. Thus, the slope of the line that describes the relationship between two variables has a steep measurement.

03

Identifying the wrong element in the survey

If one variable is correlated with another, it does not guarantee that one can cause changes in the other.

In the study, it is known that consumption of sour cream is strongly related to non-collision accidents. However, it does not imply that consumption of sour cream causes motorcycle fatalities.

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