1. In simple linear regression, r² is the

a. correlation coefficient

b. sum of the squared residuals

c. estimated regression equation

d. coefficient of determination

2. For a regression equation y = 24 -0.3x, the coefficient of correlation should be

negative.

a. True

b. False

3. What does it mean when a test is statistically significant?

a. the test statistic had a P-value higher than the alpha level

b. it is important in practical terms

c. it has reached alpha level status

d. the test statistic had a P-value lower than the alpha level

4. The weight of the average 6th grade student's backpack (with books in it) is 18.4 lbs. The principal of the school thinks that the backpack does not weight 18.4 lbs. What is the null and alternate hypothesis?

a. H0 = 18.4 Ha > 18.4

b. H0 = 18.4 Ha = 18.4

c. H0 = 18.4 Ha 18.4

d. H0 = 18.4 Ha < 18.4

5. Which of the following is not an option for analternatehypothesis?

a. Ha > k

b. Ha < k

c. Ha k

d. Ha = k