Unit 2 Review

Front

What is a scatter plot?

Back

A scatter plot is a graphical representation of two variables, showing the relationship between them using points on a Cartesian plane.

Front

What does a non-linear scatter plot indicate?

Back

A non-linear scatter plot indicates that the relationship between the two variables does not follow a straight line, suggesting a more complex relationship.

Front

What should be on the horizontal axis of a scatter plot?

Back

The horizontal axis (x-axis) typically represents the independent variable, which is the variable that is manipulated or controlled.

Front

What does a correlation coefficient of -0.4 indicate?

Back

A correlation coefficient of -0.4 indicates a moderate negative correlation, meaning as one variable increases, the other tends to decrease.

Front

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

Back

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

Front

What does a positive correlation mean?

Back

A positive correlation means that as one variable increases, the other variable also tends to increase.

Front

What does a negative correlation mean?

Back

A negative correlation means that as one variable increases, the other variable tends to decrease.

Front

What is the purpose of least squares regression?

Back

Least squares regression is used to find the best-fitting line through 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 r-squared represent in regression analysis?

Back

R-squared represents the proportion of variance in the dependent variable that can be explained by the independent variable(s) in the model.

Front

What is the significance of a correlation coefficient of 0?

Back

A correlation coefficient of 0 indicates no correlation between the two variables, meaning changes in one variable do not predict changes in the other.