Correlation and Association

A correlation value (r) that has a strong, positive linear association would have a value close to

• 1

• 0

• -1

• Cannot be answered

A scatterplot with a strong parabolic relationship would have a correlation (r) close to

• 1

• 0

• -1

• Cannot be determined

Which of the following is true about scatterplot 1?

• There is a clear parabolic correlation present

• There is a clear parabolic association present

• There is a clear strong, positive, linear association present

• None of the above are appropriate

What would be an accurate estimate of the correlation (r) if we had a scatterplot of "grams of fat" and "calories" of different brands of salad dressing

• r = 1

• r = 0.89

• r = 0

• r = -0.89

• r = -1

What would be an appropriate correlation (r) relating the number of kids you have and the number of points the Vikings score in a game?

• r = 1

• r = 0.43

• r = 0

• r = - 0.35

• r = -1

On a scatterplot, you see that there is a clear exponential pattern between "parents' income" and "college savings account balance". What statement below is true?

• There is an association between income and account balance

• There is a correlation between income and account balance

• Income and account balance are not associated

• Parent income has no affect on college savings account balance

A report comes out examining the number of births in the world and the number of storks that are on Earth. It is found that there is a strong, positive, linear association between these two variables. Which of the following is false?

• The correlation value is likely close to 1

• Drawing a line of best fit would likely be very easy on this scatterplot

• If we breed more storks, there will be more humans born

• There is still no correlation between stork populations and human populations

An insurance agent plots "number of inches of rain in a storm" and "$ amount of home insurance claims" on a scatterplot. Which correlation value is most appropriate?

• r = 1

• r = 0.87

• r = 0

• r = -0.65

• r = -1

Rick is a truck driver, and whenever he stops to go to the bathroom, he logs the "number of gallons left in his tank" and "distance traveled". Which r-value is most appropriate?

• r = 1

• r = 0.79

• r = 0

• r = -0.68

• r = -1

Walter is buying multiple Zhu-zhu pets on Amazon to sell at Christmastime. On Amazon, Walter can buy Zhu-zhu pets for $4.99 each. If he plots "number of Zhu-zhu pets purchased" and "total cost" on a scatterplot, what is an appropriate r-value?

• r = 1

• r = 0.90

• r = 0

• r = -0.78

• r = -1