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Operates cattle feed lots in several midwestern states

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Agri-Beef Inc. operates cattle feed lots in several midwestern states. The company wishes to estimate the average daily weight gain of cattle on their lots. To do this a simple random sample of cattle is taken and the daily weight gain is recorded. The data, in pounds, represent the results of the sample and is listed below.

7.5 8.4 5.5 6.2 9.0 6.3 4.8 7.0 6.1 7.9 4.4 5.7 4.8 6.9 7.0

a. Construct a 95% confidence interval estimate for the true daily weight gain.

b. Construct a 99% confidence interval estimate for the true daily weight gain.

c. Discuss the differences between the two estimates found in parts a and b and indicate the advantages and disadvantages of each.

Problem 2. Similar to problem 8-44 in the text on page 373 and problem 8-47 on the same page. A survey of 400 women for the American Orthopedic Foot and Ankle Society revealed that 38% wear flats to work.

a. Use this sample information to develop a 99% confidence interval for the population proportion of women who wear flats to work.

b. Suppose the society wished to estimate the proportion of women who wear flats to work and the proportion of women who do not wear flats to work within a margin of error of 0.01 (one percentage point) with 95% confidence. Determine the sample size required.

Reference no: EM131424598

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