Author Question: If the coefficient of correlation is .8, the percentage of variation in the dependent variable ... (Read 78 times)

oliviahorn72 · **on:** Jun 24, 2018

If the coefficient of correlation is .8, the percentage of variation in the dependent variable explained by the variation in the independent variable is
a. .80.
b. 80.
c. .64.
d. 64.

Question 2

A major department store has determined that its customers charge an average of 500 per month, with a standard deviation of 80 . Assume the amounts of charges are normally distributed.
a. What percentage of customers charges more than 380 per month?
b. What percentage of customers charges less than 340 per month?
c. What percentage of customers charges between 644 and 700 per month?