Chapter 9 Review

Front

What does a correlation coefficient of +2.00 indicate?

Back

Error in computation; correlation coefficients range from -1 to +1.

Front

What is the correlation coefficient for a perfect negative correlation?

Back

-1

Front

What is the equation of best fit for the linear regression of starting salaries for health care workers?

Back

y = 839.721x + 27541.812

Front

What type of correlation exists between gas mileage and vehicle size/weight?

Back

Negative correlation; as vehicle size increases, gas mileage typically decreases.

Front

What is the range of the correlation coefficient?

Back

-1 and 1.

Front

Define correlation coefficient.

Back

A statistical measure that describes the strength and direction of a relationship between two variables.

Front

What does a correlation coefficient of 0 indicate?

Back

No correlation; there is no relationship between the two variables.

Front

What is a positive correlation?

Back

A relationship where as one variable increases, the other variable also increases.

Front

What is a negative correlation?

Back

A relationship where as one variable increases, the other variable decreases.

Front

What is linear regression?

Back

A statistical method used to model the relationship between a dependent variable and one or more independent variables.