Question

Use R statistical software to answer the following:

A random sample of 172 women were given the flu vaccine while pregnant, and a control sample of 168 women were not given the vaccine.

2. The average birth weight for the vaccine group was 3.13 kg with a standard deviation of 0.53 kg. The average birth weight for the control group was 3.02 kg with a standard deviation of 0.45 kg.

(a) Estimate the mean difference in birth weight μ1−μ2 for the two population groups.

## R code

(b) Calculate a standard error for your estimate in (a).

## R code

(c) Calculate a 95% confidence interval for the true mean difference.

## R code

Answer 1

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