Question

The
birth weights for two groups of babies were compared in a study. In
one group the mothers took zinc supplement during pregnancy. In
another group, the mothers took a placebo. A sample of 126 babies
in the zinc group had a mean birth weight of 3305 grams. A sample
of 113 babies in the placebo group had a mean birth weight of 3476
grams. Assume that the population standard deviation for the zinc
group is 871 grams, while the population standard deviation fuller
the placebo group is 672 grams. determine the 90% confidence
interval for the true difference between the mean birth weights for
zinc babies versus the placebo babies

1) find the point estimate for the true difference between the
population means

2) calculate the margin of error of a confidence interval for
the difference between the two population means.round your answer
to six decimal places

3) construct a 90% confidence interval and round your answer
to the nearest whole number

Answer #1

so 90% confidence interval ( -336 , -6)

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