Question

Exclusive breastfeeding during the first six months of life is recommended for optimal infant growth and development. Suppose that you conducted a survey of randomly chosen women from California and found that 775 out of 5615 new mothers exclusively breast fed their infants.

a.) Suppose that in 2010, the rate of exclusive breastfeeding in
California was known to be 18.6%. Based on the 95% CIs calculated, is there
evidence against the null hypothesis that the underlying rate is equal to 18.6% in
favor of the alternative that the rate is different from 18.6%?

b.) To confirm your answer to part a), perform a two-sided hypothesis
test and interpret the p-value. State the null and alternative hypotheses:

c.) Calculate the test statistic:

d.) Calculate the p-value: use r. code

e.) Interpret the p-value:

Answer 1