1. If, on average, y curves up and then curves down as x increases, the Pearson's correlation coefficient, r, is... A) above 1 B) below -1 C) positive D) negative E) near zero

2. The Coefficient of Determination, Adjusted R2 , multiplied by 100, is ...

A) the standard deviation of the correlation coefficient.

B) the difference between observed responses and the values predicted by the regression model. C) the percentage of the variability in y that is explained by the regression model.

D) the Standard Error of the Estimate, divided by the sum of squares total.

E) None of the above are true

3. All but one of the statements below contains a mistake. Which one could be true?

A) The correlation between age and vocabulary is 0.817 years.

B) The correlation between a car's length and its fuel efficiency is 0.71 miles per gallon.

C) The correlation between weight and height is .327.

D) The correlation between hair length and age is -0.171 inches.

4.For the same data set, which Confidence Interval of the sample mean would have lower and upper endpoints that are the closest together? A) 85% CI B) 90% CI C) 95% CI D) 99% CI

5. Which is NOT true about experiments?

A) If subjects are not aware of the treatment and researchers are aware, single-blinding is being used.

B) The experimental factors have values that are controlled by the experimenter.

C) Random selection of participants will guarantee equivalent treatment groups.

D) Random assignment of participants will allow stronger inference of causality.

E) All of the above statements are true.