# The use of z scores allows comparisons between variables measured

? Question 1 0 out of 10 points

The use of z scores allows comparisons between variables measured on different scales and units.

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? Question 2 10 out of 10 points

As the value of r increases, the proportion of variability of Y that is accounted for by X decreases.

? Question 3 0 out of 10 points

In a positive relationship as X increases, Y increases.

? Question 4

10 out of 10 points

A correlation coefficient expresses the direction but not the magnitude of a relationship.

? Question 5 10 out of 10 points

For a linear relationship to exist, all the points must fall on a straight line.

? Question 6 10 out of 10 points

If the relationship is imperfect, the value of the correlation coefficient must be negative.

? Question 7 10 out of 10 points

The slope of a line is a measure of its rate of change.

? Question 8 10 out of 10 points

In an inverse relationship as one variable gets larger the other variable gets smaller.

? Question 9 10 out of 10 points

The range of a correlation coefficient is 0 to +1.

? Question 10 10 out of 10 points

Since r is so widely used, it is appropriate to calculate r for nonlinear data.