* not completed

. If consumption of caffeine and alertness are positively correlated, which of the following is false?

The correlation coefficient is greater than 0. correct incorrect

The coefficient of determination is greater than 0. correct incorrect

The correlation coefficient is half the coefficient of determination. correct incorrect

The correlation coefficient is the square root of the coefficient of determination. correct incorrect

* not completed

. Which of the following is true, regarding correlations, regressions, and coefficient of determination?

The calculated values of all three are positively correlated correct incorrect

The strength of all three are positively correlated correct incorrect

The variability of all three are positively correlated correct incorrect

None of the above correct incorrect

* not completed

. If you graph a regression line over a scatterplot, which of the following is last likely to be immediately clear?

Whether the relationship between two variables is positive, negative, or close to zero correct incorrect

Whether there is a relationship between two variables correct incorrect

The overall and general distribution of the data correct incorrect

The mean differences between two variables correct incorrect

* not completed

. The correlation coefficient measures the _________________ between two variables.

causality correct incorrect

independence correct incorrect

association correct incorrect

difference correct incorrect

* not completed

. A researcher calculated his coefficient of determination and found that it was .49. How many possible correlation coefficients can possibly lead to this result?

1 correct incorrect

2 correct incorrect

3 correct incorrect

insufficient information correct incorrect