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The birth weights for two groups of babies were compared in a study. In one group...

The birth weights for two groups of babies were compared in a study. In one group the mothers took a zinc supplement during pregnancy. In another group, the mothers took a placebo. A sample of 171 babies in the zinc group had a mean birth weight of 3059 grams. A sample of 158 babies in the placebo group had a mean birth weight of 3465grams. Assume that the population standard deviation for the zinc group is 698 grams, while the population standard deviation for the placebo group is 593 grams. Determine the 95% confidence interval for the true difference between the mean birth weights for "zinc" babies versus "placebo" babies.

Step 1 of 3 :  

Find the point estimate for the true difference between the population means.

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