AP Stats Unit 2 Practice

Identify the term being interpreted below:"When the weight (x) is zero the predicted height (y) is 10 inches"

• slope

• y-intercept

• standard deviation of the residuals (S)

• coefficient of determination (r^2)

The least squares regression line minimizes which of the following quantities?

• The sum of the squared differences between the obbserved values of the response variable and the mean of the response variable.

• The sum of the square differences between the observed values of the explanatory variable and the mean of the explanatory variable.

• The sum of the squared differences between the observed values of the response variable and the predicted values of the response variable.

• The sum of the squared differences between the observed values of the explanatory variable and the predicted values of the explanatory variable.

Which of the following is the correct formula for slope of a least squares regression line? (r = correlation, Sx = standard deviation of x values, Sy = standard deviation of y values)

• slope = r*(Sx/Sy)

• slope = r*(Sy/Sx)

• slope = (r*Sx/r*Sy)

• slope = (Sy/Sx) + r

Normal model

• A

• B

• C

• D

• E

Hint 1: Use inverse Normal model

Hint 2: Find SD...use algebra

Hint 3: Use normal model

• A

• B

• C

• D

• E

Hint: Transform data, then use Normal model

• A

• B

• C

• D

• E

Hint: Use formula sheet.

• A

• B

• C

• D

• E

Hint: Formula for conversion:

F = C * 9/5 + 32

• A

• B

• C

• D

• E

Hint 1: Find p(x=0)

Hint 2: Find mean of distribution

• A

• B

• C

• D

• E

Hint 1: Is this binomial or geometric setting?

Hint 2: Use formula sheet

• A

• B

• C

• D

• E