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A random sample of the height of apple tree was recorded. 11.3,11.7,10.7,12.2,12.8,13.511.3,11.7,10.7,12.2,12.8,13.5. 1.(5) Apply the backward...

A random sample of the height of apple tree was recorded. 11.3,11.7,10.7,12.2,12.8,13.511.3,11.7,10.7,12.2,12.8,13.5.
1.(5) Apply the backward empirical rule to check normality of the data, and conclude if any evidence of non-normality.
2.(5) Assume the height of the apple is normal, calculate the 95%95% two-sided confidence interval for the true population average height.
3.(5) Assume that population variance σ2=1.32σ2=1.32 and the bound on the error of estimation of 95%95% confident interval to be 11. Find the minimum sample size nn.

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