Chapter 2 TEST

Front

What type of association does a graph show if there is no correlation?

Back

No correlation means that there is no predictable relationship between the two variables.

Front

What does Y-hat represent in regression analysis?

Back

Y-hat is the predicted value of y for a given value of x.

Front

What is the correlation coefficient of a perfect negative correlation?

Back

-1

Front

What does a correlation coefficient of -.928 indicate?

Back

It indicates a strong negative correlation between the two variables.

Front

How do you make a prediction using the regression line?

Back

You plug in a value for x and simplify to find the corresponding y-hat.

Front

What is a positive correlation?

Back

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

Front

What is a negative correlation?

Back

A negative correlation means that as one variable increases, the other variable decreases.

Front

What does a correlation coefficient of 0 indicate?

Back

A correlation coefficient of 0 indicates no correlation between the variables.

Front

What is the purpose of a scatter plot?

Back

A scatter plot visually represents the relationship between two quantitative variables.

Front

What is the range of correlation coefficients?

Back

The range of correlation coefficients is from -1 to 1.