1.) How do you interpret an r value of -0.70?

a) None of the other choices is correct.

b) weak downhill linear relationship

c) strong downhill linear relationship

d) strong uphill linear relationship

2.) You want to use X to predict Y using the best straight line. How do you determine which line fits best?

a) None of the other choices is correct.

b) The one with the largest sum of squares for the total.

c) The one with the smallest sum of squares for the total.

d) The one with the largest sum of squares for error.

e) The one with the smallest sum of squares for error.

3.) Bill collects data on study time (hours) and exam score (points), and finds r = .7. What does he conclude? Choose the best answer.

a) It is not correct to try to correlate study time and exam score.

b) The correlation between study time and exam score is .7.

c) The correlation between study time and exam score is .70 points per hour.

d) The correlation between study time and exam score is .70 hours per point.

4.) You only need five numbers to be able to calculate the best fitting regression line. What are those five numbers?

a) the median of X, the median of Y, the mean of X, the mean of Y, and the correlation.

b) the mean of X, the mean of Y, the standard deviation of X, the standard deviation of Y, and the correlation

c) None of the other choices is correct

d) the min, the max, Q1, the median, and Q3

5.) You roll 25 dice over and over and look at the sampling distribution of X-bar (the average). What is its standard error?

a) .342

b) Not enough information.

c) 1.71

d) 1/6

e) .0684