The following nine observations were drawn from a normal population: 27, 19, 20, 24, 23, 29, 21, 17, 27. (i) Test the null hypothesis H0 : m = 26 against the alternative hypothesis Ha : m ≠ 26. At what level of significance can H0 be rejected? (ii) At what level of significance can H0 : m = 26 be rejected when tested against Ha : m < 26?

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