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In a study reported in The Wall Street Journal (April 4, 1999), the Tupperware Corporation surveyed 1,007 U.S. workers. Of the people surveyed, 665 indicated that they take their lunch to work with them. Of these 665 taking their lunch, 200 reported that they take them in a brown bag.
a) Verify that the requirements for constructing the confidence interval about people who take their lunch to work with them are satisfied.
b) Calculate by hand and interpret a 95% confidence interval estimate of the population proportion of U.S. workers who take their lunch to work with them. Using Minitab to confirm your 95% CI results.
c) Calculate by hand and interpret a 95% confidence interval estimate of the population proportion who take brown-bag lunches of those taking their lunches. Using Minitab to verify your results.
d) Verify that the requirements for constructing the confidence interval about people who take brown bag lunches, are satisfied.
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