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21)The reason for using the t-distribution is: a) the population standard deviation is unknown, and the sample size is fairly small b) it is easier to use by students c) it provides a good representation of the risk under consideration d) a, b, c, are true e) None of these are true f) only a and care true 22)In testing the hypothesis, which steps should precede the collection and examination of data: a) define Ho b) define Ha c) select the level of significance d) a, b, c, are true e) None of these are true f) only a and care true