In conducting the hypothesis test below, your sample consists of 22 observations, with a mean of 24 and standard deviation of 4.4. Ho: M 21.5 a) This is a Select an answer b) Calculate the test statistic, rounded to 3 decimal places. t c) At a = 0.1, the rejection region is Ot 1.323 Ot 1.721 O none of the above d) The decision is to O reject H1 since the test statistic falls in the rejection region. O reject Ho since the test statistic falls in the rejection region. O fail to reject H1 since the test statistic does not fall in the rejection region. O fail to reject Ho since the test statistic does not fall in the rejection region. O none of the above