AP Stats Unit 2 Vocab Practice

Front

What does the standard deviation of the residuals (s) represent?

Back

The approximate size of a typical prediction error.

Front

What is the purpose of a residual plot?

Back

To assess how well a regression line fits the data.

Front

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

Back

y-intercept.

Front

Identify the term being interpreted: 'The actual height(y) is typically about 2.6 in away from the height predicted by the LSRL given weight(x).'

Back

standard deviation of the residuals (S).

Front

What is the equation of a least-squares regression line?

Back

ŷ = a + bx.

Front

What does the slope of a regression line represent?

Back

The change in the response variable for a one-unit change in the explanatory variable.

Front

What is the coefficient of determination (r^2)?

Back

The proportion of variation in the response variable explained by the regression line.

Front

What does a residual represent in regression analysis?

Back

The difference between the observed value and the predicted value.

Front

What is an outlier in the context of regression analysis?

Back

A data point that deviates significantly from the other observations.

Front

What does a positive residual indicate?

Back

The observed value is greater than the predicted value.