Suppose you wish to test the claim that µ < 28.3. given a sample of n = 86 and a significance of 0.05, what criterion would you be used for rejecting the null hypothesis? Assume that the standard deviation of the population is know.
a) rejecting Ho if test statistic > -1.645
b) rejecting Ho if test statistic < -1.645
c) rejecting Ho if test statistic > -1.96
d) rejecting Ho if test statistic < 1.645