2a)The results from a simple random sample from a stratified population are given in the below table. The columns are th

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2a The Results From A Simple Random Sample From A Stratified Population Are Given In The Below Table The Columns Are Th 1 (91.79 KiB) Viewed 33 times

2a)The results from a simple random sample from a stratified population are given in the below table. The columns are the stratum size, the stratum sizes, the state sample sizes, the sample mean and the sample variance Startum Nh nh yn 1 100 20 115.7 2 200 20 147.2 3 300 20 133.6 Assuming the observed sample variance are the true sample variance, find the optimal allocation for a sample of size 20 b) Given that the heights of students in college are normally distributed with standard deviation 5in. Find the maximum size required to construct a 95% C.I for mean with maximum error =0.5in