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Chapter 8: Q 32 (page 478)
Identify the following specifications:
a. lower limit
b. upper limit
c. error bound
The lower limit is 24.52
The upper limit is 36.28
The error bound is 5.88
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Suppose we know that a confidence interval is (). Find the error bound and the sample mean.
Using the same , , and level of confidence, suppose that were instead of . Would the error bound become larger or smaller? How do you know?
Suppose average pizza delivery times are normally distributed with an unknown population mean and a population standard deviation of six minutes. A random sample of pizza delivery restaurants is taken and has a sample mean delivery time of minutes.
Find a % confidence interval estimate for the population mean delivery time.
Of 1,050 randomly selected adults, 360 identified themselves as manual laborers, 280 identified themselves as non-manual wage earners, 250 identified themselves as midlevel managers, and 160 identified themselves as executives. In the survey, 82% of manual laborers preferred trucks, 62% of non-manual wage earners preferred trucks, 54% of mid-level managers preferred trucks, and 26% of executives preferred trucks
Construct a 95% confidence interval. State the confidence interval, sketch the graph, and calculate the error bound
Which distribution should you use for this problem?
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