Chapter 1. The Correlation Coefficient: What’s in a Number?

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Infographic Activity 1.3 The Correlation Coefficient: What’s in a Number?

A correlation indicates a relationship between two variables, such as the amount of time you spend studying and the grade you get on a test. This relationship is often indicated using a correlation coefficient, symbolized as r. To interpret the relationship using a correlation coefficient (r), ask yourself two questions:

(1) What is the direction of the relationship?

(2) What is the strength of the relationship?

A scatterplot helps us see what the correlation looks like. And remember, a correlation between two variables does not necessarily mean the one variable caused the change in the other variable.

Click the image to enlarge.

Click "Next" to continue.

Quiz

Question 1.1

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Correct.
Incorrect.

Question 1.2

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Correct.
Incorrect.

Question 1.3

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Correct.
Incorrect.

Question 1.4

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Correct.
Incorrect.

Question 1.5

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Correct.
Incorrect.

Question 1.6

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Correct.
Incorrect.

Question 1.7

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Correct.
Incorrect.

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