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Many medical professionals believe that eating too much red meat increases the risk of heart disease...

Many medical professionals believe that eating too much red meat increases the risk of heart disease and cancer. Suppose you would like to conduct a survey to determine the annual consumption of beef by a typical American and want to use four pounds as the desired margin of error for a confidence interval of the population mean. Assume the population standard deviation is 20 pounds. Determine the sample size when:

A 90% confidence interval is desired for the mean amount of beef consumed.

B 99% confidence interval is desired for the mean amount of beef consumed.

Suppose you want to develop a confidence interval for the proportion of Americans who over-consume red meat with a desire margin of error of 0.1%. Determine the sample size needed when:

c) A 90% confidence interval is desired for the proportion of Americans who over-consume red meat.

d) A 95% confidence interval is desired for the proportion of Americans who over-consume red meat.

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