Calculating the Correlation Coefficient

Which graph represents data that has a correlation coefficient close to -1?

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What is the Pearson correlation coefficient used for?

• It is used to measure the strength and direction of the linear relationship between two variables.

• It is used to measure the strength and direction of the relationship between a variable and a constant value.

• It is used to measure the strength and direction of the relationship between three or more variables.

• It is used to measure the strength and direction of the non-linear relationship between two variables.

What is the range of values for the Pearson correlation coefficient?

• -1 to 1

• 0 to 1

• 1 to 10

• -10 to 10

What is Spearman's rank correlation coefficient used for?

• Measuring the strength and direction of the linear relationship between two variables.

• Calculating the mean of two variables.

• Determining the mode of two variables.

• Measuring the strength and direction of the monotonic relationship between two variables.

How is Spearman's rank correlation coefficient calculated?

• By counting the number of data points in each variable

• By measuring the linear relationship between two variables

• By calculating the mean of the two variables

• By measuring the strength and direction of the monotonic relationship between two variables

What is the range of values for Spearman's rank correlation coefficient?

• 0 to 1

• -1 to 1

• 1 to 10

• 10 to 100

What does a Pearson correlation coefficient of 0 indicate?

• perfect positive linear relationship

• perfect negative linear relationship

• weak positive linear relationship

• no linear relationship

The correlation coefficient is a number "r" such that: 

• -1<r<1

• -1>r>1

• -1≤r≤1

• -1≥r≤1

r=-0.89

• Strong positive 

• Weak positive 

• Strong negative 

• Weak negative 

Determine the Correlation Coefficient and decide whether it is weak, moderate, or strong.

• -0.19 weak

• -0.19 moderate

• 0.04 weak

• 0.04 strong