Question

ASAP PLS

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 165 babies in the zinc group had a mean birth weight of 3466 3466 grams. A sample of 158 babies in the placebo group had a mean birth weight of 3242 grams. Assume that the population standard deviation for the zinc group is 833 grams, while the population standard deviation for the placebo group is 587 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.

Step 2 of 3:

Calculate the margin of error of a confidence interval for the difference between the two population means. Round your answer to six decimal places.

Step 3 of 3:

Construct the 95% confidence interval. Round your answers to the nearest whole number.

Answer 1

Let , be the population mean birth weight foe "zinc" babies and b ethe population mean birt weight for "placebo" babies,

Step 1 of 3 : Point estimate=

Step 1 of 3 : Now , ; From Z-table

Therefore ,the margin of error is ,

Step 1 of 3 : The 95% confidence interval is ,