Exploring the Correlation Coefficient in Three Steps

The video tutorial explains the concept of the correlation coefficient, a measure that summarizes a scatterplot into a single number between -1 and 1. It outlines three steps to calculate it: fitting a straight line to the data, determining the slope's direction, and assessing the magnitude by comparing scatter along the y-axis and around the fitted line. The video also provides examples to illustrate how different scatter plots affect the correlation coefficient's value.

What is the range of values for the correlation coefficient?

• 0 to 2

• -2 to 2

• -1 to 1

• 0 to 1

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What is the first step in calculating the correlation coefficient?

• Determining the sign of the slope

• Comparing scatters

• Fitting a straight line to the data

• Calculating the mean

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What does a positive slope indicate about the correlation coefficient?

• It is greater than 1

• It is between -1 and 0

• It is exactly 0

• It is between 0 and 1

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CCSS.HSS.ID.B.5

If the slope of the fitted line is perfectly straight, what is the value of the correlation coefficient?

• 1

• -1

• 0

• 0.5

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What does the correlation coefficient use to determine its magnitude?

• The mean of the data points

• The scatter along the y-axis and around the fitted line

• The total number of data points

• The slope of the fitted line

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Which scatter plot has the highest correlation coefficient?

• The one with the most scatter around the fitted line

• The one with the most scatter along the y-axis

• The one with the least scatter along the y-axis

• The one with the least scatter around the fitted line

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In a data set where the scatter along the y-axis is much larger than the scatter around the fitted line, what can be said about the correlation coefficient?

• It is close to zero

• It is exactly zero

• It is large in magnitude

• It is negative

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What is the correlation coefficient if the scatter along the y-axis and the scatter around the fitted line are exactly equal?

• 0

• -1

• 0.5

• 1

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When comparing two scatter plots, what indicates a larger correlation coefficient?

• Larger scatter around the fitted line

• Smaller scatter along the y-axis

• Larger scatter along the y-axis

• Smaller scatter around the fitted line

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What are the three steps in determining the correlation coefficient?

• Fitting a straight line, calculating the mean, comparing scatters

• Fitting a straight line, determining the sign, comparing scatters

• Calculating the mean, determining the sign, comparing scatters

• Determining the sign, calculating the mean, comparing scatters

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CCSS.HSS.ID.C.8