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Q4.(15) One random sample of the height of one type of tree was recorded. 7, 9...

Q4.(15) One random sample of the height of one type of tree was recorded. 7, 9 ,10, 7 ,12 ,10, 8, 13 ,15, 9 1.(5) Apply the backward empirical rule to check normality of the data, and conclude if any evidence of non-normality. 2) Assume the height of the tree is normal, calculate the 99% two-sided confidence interval for the true population average height. 3.(5) Assume that we know the population variance σ2=9, and we request the bound on the error of estimation of 99% confidence interval to be 2, find the minimum sample size n.

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