for a research with 3 different groups, what should be the sample size for the second group; when the first group has a weight of 0.5 and standard deviation of 0.2, second group with a weight of 0.3 and standard deviation 0.4 and last group with the weight of 0.2 and standard deviation of 0.9 with non-proportionate stratified method, 95% confidence interval (Z = 1.96) and 0.04 tolerance level ?
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