Question 1 10 out of 10 points
Rho is used where one or both variables are at least of interval scaling.
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? Question 2
10 out of 10 points
The easiest way to determine if a relationship is linear is to calculate the regression line.
? Question 3 10 out of 10 points
If scores are z scores and if r equals 1 then zX will always equal zY.
? Question 4 10 out of 10 points
Pearson r requires that the data be of interval or ratio scaling.
? Question 5 10 out of 10 points
For a linear relationship to exist, all the points must fall on a straight line.
? Question 6 0 out of 10 points
The formula for rho is actually just the formula for Pearson’s r simplified to apply to lower order scaling.
? Question 7 10 out of 10 points
If the value of r on ratio scaled raw data were 0.87 and the pairs of numbers were converted to ordinal data, and r calculated for the ordinal data, r would equal 0.87.
? Question 8 10 out of 10 points
Restricting the range of either X or Y will generally lower the correlation between the variables.
? Question 9 10 out of 10 points
In an inverse relationship as one variable gets larger the other variable gets smaller.
? Question 10 10 out of 10 points
In a straight line the slope approaches zero as the line comes near the point X, Y.