set of observations x1, x2,...,xn, with mean ¯x, then:
(xi x¯) > 0.
ii. For two independent events A and B such that P(A) > 0 and P(B) > 0,
P(A [ B) < P(A) + P(B).
iii. For a random variable X, E(X2) can be less than (E(X))2.
iv. Rejecting a true null hypothesis is known as the power of a test.
v. A 4-by-2 contingency table which results in a 2 test statistic value of
6.724 is statistically significant at the 5% significance level.