For a research with 3 different groups, what should be the sample size forthe second group;...

 

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For a research with 3 different groups, what should be the sample size forthe 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 deviationof 0.4 and last group with the weight of 0.2 and standard deviation of 0.9, with non- proportional stratified method, 95% confidence interval (Z-1,96) and 0.04 tolerance level? For a research with 3 different groups, what should be the sample size forthe 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 deviationof 0.4 and last group with the weight of 0.2 and standard deviation of 0.9, with non- proportional stratified method, 95% confidence interval (Z-1,96) and 0.04 tolerance level?