AP Statistics Unit 5 Review

Which of the following points has the greatest influence on the strength of the correlation coefficient?

• A

• B

• C

• D

• E

Which of the graphs would have a correlation coefficient of r = 0.69 ?

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• 
• 
• 

Which of these is the best interpretation of the number 0.1297?

• For each additional square foot of area, the price is predicted to increase by about $0.1297

• A house which has 0 square feet is predicted to cost about $0.1297

• For each additional square foot, the price of the house is predicted to increase about $12.97.

• For each additional square foot of area, the price of the house is predicted to increase 129.70.

A health researcher wishes to show that running can help reduce weight. x is the total running time per week (in minutes) and y is the amount of weight loss (in kg). From the regression line given, estimate the amount of weight loss if a person ran for four hours in a week, correct to 2 significant figures.

_____________________ is the use of a regression line for prediction outside the interval of x values used to obtain the line.

A residual...

• the difference between the actual value of y and the value of y predicted by the regression line

• actual y - predicted y

• the difference between the actual value of x and the value of x predicted by the regression line

Shown is a residual plot. Would a linear regression model of the data be most appropriate?

• YES

• NO

The ___________________ measures the percent of the variability in the response variable that is accounted for by the least-squares regression line.

• coefficient of determination

• coefficient of relaxation

You are analyzing a scatter plot that has a negative correlation. What is true of the of the x and y values?

• As x increases, y decreases

• As x increases, y increases

• As x decreases, y decreases

• A

• B

• C

• D

• E