If a correlation coefficient is 0.80, then:
a. the explanatory variable is usually less than the response variable.
b. the explanatory variable is usually more than the response variable.
c. below-average values of the explanatory variable are more often associated with below-average values of the response variable.
d. below-average values of the explanatory variable are more often associated with above-average values of the response variable.
e. none of the statements are correct.

Suppose there is a simple index of three stocks, stock abc, stock xyz, and stock qrs. stock abc opens on day 1 with 4000 shares at $3.15 per share. stock xyz opens on day 1 with 5000 shares at $4.30 per share. stock qrs opens on day 1 with 6000 shares at $4.60 per share. the price of stock abc on day 8 begins at $3.50. the price of stock xyz on day 8 begins at $3.90. stock qrs opens on day 8 with a price of $4.50 per share. assume that each stock has the same number of shares that it opened with on day 1. what is the rate of change of this simple index over 1 week?

Based on the figures as marked, /\rqs = —

Which of the following is true for the relation f(x)=2x^2+1