Correlation Coefficient and Linear Regression Review

• r=.99

• r=.98

• r=20.7

• r=-35

Which graph most clearly shows a positive correlation between the x- and y−values?

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Which correlation coefficient is most accurate for this data set?

• r = - 0.3

• r = 0.99

• r = -0.99

The linear regression equation that best represents the line of best fit for the data is y=20.8x-35. What does the slope represent?

• The number of bacteria increase by 20.8 per hour

• The number of bacteria increase by 20.8 per minute

• The number of bacteria decrease by 35 per hour

• The number of bacteria decrease by 35 per minute

The linear regression equation that best represents the line of best fit for the data is y=20.8x-35. Use the equation to predict the number of bacteria in 24 hours.

• 35

• 277

• 464

• 819

Which graph most clearly shows a negative correlation between the x- and y−values?

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Which graph most clearly shows a no correlation between the x- and y−values?

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Describe the relationship between the variables.

• Weak positive correlation

• Weak negative correlation

• Strong positive correlation

• Strong negative correlation

r=-0.89

• Strong positive 

• Weak positive 

• Strong negative 

• Weak negative 

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

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