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 it mean if a scatter plot is non-linear?

Back

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

Front

What is an explanatory variable?

Back

An explanatory variable, also known as an independent variable, is the variable that is manipulated or changed to observe its effect on another variable.

Front

What is a response variable?

Back

A response variable, also known as a dependent variable, is the variable that is measured or observed in an experiment to see how it is affected by changes in the explanatory variable.

Front

How do you calculate the residual in a regression model?

Back

The residual is calculated as the difference between the observed value and the predicted value from the regression model.

Front

What does a positive correlation indicate?

Back

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

Front

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

Back

The y-intercept represents the expected value of the response variable when the explanatory variable is zero.

Front

What does r-squared (r²) represent in regression analysis?

Back

R-squared (r²) represents the proportion of variance in the response variable that can be explained by the explanatory variable.

Front

What is the formula for a linear regression model?

Back

The formula for a linear regression model is typically expressed as y = a + bx, where 'a' is the y-intercept and 'b' is the slope.

Front

What is the significance of the slope in a regression equation?

Back

The slope indicates the rate of change in the response variable for each unit change in the explanatory variable.