regression calculator stat analysis 4

What does "r" represent?

• correlation coefficient

• coefficient of determination

• regression coefficient

• regression value

What does r² represent?

• correlation coefficient

• coefficient of determination

• regression coefficient

• regression value

What values of r are acceptable?

• 0 ≤ r ≤ 1

• 0 < r < 1

• -1 ≤ r ≤ 1

• -1 < r < 1

What does "dimmismatch" mean?

• requested value is off the screen

• GOTO

• the lists are different lengths

• the statplot window is not correctly aligned

• the wrong graph is selected in statplot

What does r measure?

• how closely the data fits the regression

• how closely the data fits a linear model

• how much variation in observations

• the value of the residual

If r = -0.54,

• weak negative correlation

• strong negative correlation

• strong positive correlation

• weak positive correlation

• no correlation

Identify the best prediction for the value of r .

• r = 0.9

• r = 0.23

• r =-0.92

• r = 1

• r = -1

Describe the correlation.

• moderate positive linear

• moderate negative linear

• weak positive linear

• weak positive quadratic

• moderate positive quadratic

If the lowest point on the graph is removed, describe the impact on the least squares regression and on "r".

• r will increase, slope will increase, y-int will decrease

• r will increase, slope will increase, y-int will increase

• r will increase, slope will decrease, y-int will increase

• r will increase, slope will decrease, y-int will decrease

• r will increase, slope will remain the same, y-int will remain the same

If the lowest point on the graph is removed, describe the impact on the reliability of predictions based on the new linear model.

• reliability of predictions will remain the same

• predictions will be more reliable

• predictions will be less reliable

• nothing can be determined about the change in the reliability of predictions