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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

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