AP Stats Chapter 3 Practice Test

Front

What is the least-squares regression line?

Back

A statistical method used to determine the line of best fit for a set of data points by minimizing the sum of the squares of the vertical distances of the points from the line.

Front

What does the slope of a regression line represent?

Back

The slope indicates the predicted change in the dependent variable for each one-unit increase in the independent variable.

Front

What is the meaning of the y-intercept in a regression equation?

Back

The y-intercept is the predicted value of the dependent variable when the independent variable is zero.

Front

How do you interpret a negative slope in a regression line?

Back

A negative slope indicates that as the independent variable increases, the dependent variable tends to decrease.

Front

What is standardization in statistics?

Back

Standardization is the process of transforming data to have a mean of 0 and a standard deviation of 1.

Front

What is the correlation coefficient?

Back

A statistical measure that describes the strength and direction of a linear relationship between two variables, ranging from -1 to 1.

Front

What does a correlation of -0.44 indicate?

Back

It indicates a moderate negative linear relationship between the two variables.

Front

What is a residual plot?

Back

A graphical representation of the residuals on the vertical axis and the fitted values on the horizontal axis, used to assess the fit of a regression model.

Front

What does the term 'fitted value' mean in regression analysis?

Back

The fitted value is the predicted value of the dependent variable based on the regression model.

Front

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

Back

It represents the typical distance that the observed values fall from the regression line.