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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 173 babies in the zinc group had a mean birth weight of 3098 grams. A sample of 157 babies in the placebo group had a mean birth weight of 3346 grams. Assume that the population standard deviation for the zinc group is 582 grams, while the population standard deviation for the placebo group is 539 grams. Determine the 98% 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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