Let, (8.49, 10.39, 9.76, 12.66, 10.35, 10.96, 8.25, 12.14, 7.52, 8.92) ** N(µ, o²) with (a) HER is unknown and o? = 9. At a = 0.01 or 1% significance level test Ho : µ = 9 against H1 : µ # 9. That is calculate the Z-statistic and the p-value of the test and then comment on the null hypothesis.

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