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Math 1530 Chapter 6 Review Questions
1. Assume that a computer was used to generate the given confidence interval of
(136, 150) for the population mean, µ. Find the margin of error and the point estimate of the mean.
2. Find the critical value z?/2 that corresponds to a 98% degree of confidence.
2b. Find the critical t?/2 that corresponds to a 98% degree of confidence. The sample size is 25.
3. Find the margin of error (E) one would use in estimating the population mean µ for weights of eggs at the 95%
confidence level; where n = 49, x-bar = 1.71, and s = 0.39.
4. Write the confidence interval for #3.
5. A random sample of 94 light bulbs had a mean life of x-bar = 548 hrs with s = 29 hrs. Construct a 90%
confidence level for the mean life, µ, of all light bulbs of this type.
6. The drug Lipitor is meant to lower cholesterol levels. In a clinical trial of 863 patients who received 10-mg doses
of Lipitor daily, 47 reported a headache as a side effect. ...

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