If the coefficient of determination is .81, then the coefficient of correlation _____.

If the coefficient of determination is .81, then the coefficient of correlation _____.
 a. is .6561
  b. must be 0.9
  c. must be positive
  d. None of the answers is correct.

Q. 2

The definition of service level used in this chapter is
 a. the percentage of all demand that can be satisfied from inventory.
  b. the percentage of all order cycles that do not experience a stockout.
  c. the percentage of demand during the lead-time period that can be satisfied from inventory
  d. None of the alternatives is correct.

Q. 3

A company has developed a new power cell and wants to estimate its average lifetime. A random sample of 650 power cells is tested and the average lifetime of this sample is found to be 315 hours. The 315 hours is the value of a:
 a. parameter. c. sample.
  b. statistic. d. population.

Q. 4

The numerical value of the coefficient of determination ______.
 a. is always larger than the coefficient of correlation
  b. is always smaller than the coefficient of correlation
  c. is negative if the coefficient of determination is negative
  d. can be larger or smaller than the coefficient of correlation