Which of the following is an example illustrating the use of variance?

Which of the following is an example illustrating the use of variance?
 a. As a measure of risk.
  b. As a judge of consistency.
  c. To search for and reduce variability in a process.
  d. All of these choices are true.

Q. 2

The Friedman test is always:
 a. one-tail with > in the alternative hypothesis.
  b. one-tail with < in the alternative hypothesis.
  c. two-tail
  d. None of these choices.

Q. 3

The statistic s2 is an unbiased and consistent estimator of 2.
  Indicate whether the statement is true or false

Q. 4

In a Friedman test for comparing three populations, provided that there are five blocks, the test statistic is calculated as Fr = 6.594 . Then, the most accurate statement that can be made about the p-value is:
 a. p-value < 0.025
  b. .05 < p-value < .10
  c. .025 < p-value < .05
  d. p-value > .10