1 - In a survey of 1002 people, 701 said that they voted in a recent presidential election (based on data from the ICR Research Group). Voting records show that 61% of eligible voters actually did vote.
a. Find a 99% confidence interval estimate of proportion of people who say they voted.
b. Are the survey results consistent with the actual voter turnout of 61%? Why or why not?
2 - A random sample of the birth weights of 186 babies has a mean of 3103 g and a standard deviation of 696 g.
These babies were born to mothers who did not use cocaine during their pregnancies.
a. Construct a 95% confidence interval estimate of the mean birth weight for all such babies.
b. Compare the result to the confidence interval of 2607.724 < μ < 2792.276 for the birth weights of babies born to mothers who used cocaine during pregnancy.
c. Does cocaine use appear to affect the birth weight of a baby?
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