Vocabulary for Bivariate Quiz

Question 1

Correlation coefficient

Answer 1

r

Measures the strength and direction between two numerical variables.

Question 2

LSRL

Answer 2

Least Squares Regression Line

the prediction for y = y-intercept + slope (x)

Question 3

extrapolation

Answer 3

When the LSRL is used to make predictions outside the range of the x-values

Question 4

slope

Answer 4

For every additional x, the amount of change predicted to occur in y.

Question 5

y-intercept

Answer 5

The predicted y-value when x=0

Question 6

Outlier

Answer 6

A point that is unusually far away from the rest of the data and does NOT follow the trend.

Question 7

Leverage Point

Answer 7

A point that has an x-value that is far away from average.

Question 8

Influential Point

Answer 8

A point that if removed will change the slope of the LSRL.

Question 9

Residual

Answer 9

Actual value - Predicted value

Question 10

R squared

Answer 10

Gives the percent of the variability in y that can be explained by the LSRL.

Question 11

Standard deviation of the residuals

Answer 11

S

The average error OR the average distance the data points are from the LSRL.