Linear Regression
100

(rs_y)/s_x

What is  b_1 in the linear regression model  y = b_0+b_1x ? 

200

y-hat y

What is the residual ?

300

If a regression model successfully captures the underlying relationship, the residual plot should look like this

What is a random collection of points?

400

Each hat y  tends to be closer to its mean (in standard deviations) than its corresponding x was

What is regression to the mean ?

500

The fraction of variability in the responses that can be explained by the model

What is R^2 ? 

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