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Chapter 8: Q.42 (page 479)
Explain in complete sentences what the confidence interval means.
A confidence interval is a kind of interval estimate of a population parameter
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The mean age for all Foothill College students for a recent Fall term was . The population standard deviation has been pretty consistent at . Suppose that twenty-five Winter students were randomly selected. The mean age for the sample was . We are interested in the true mean age for Winter Foothill College students. Let the age of a Winter Foothill College student.
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The population standard deviation for the height of high school basketball players is three inches. If we want to be % confident that the sample mean height is within one inch of the true population mean height, how many randomly selected students must be surveyed?
A poll of 1,200 voters asked what the most significant issue was in the upcoming election. Sixty-five percent answered the economy. We are interested in the population proportion of voters who feel the economy is the most important.
Construct a 90% confidence interval, and state the confidence interval and the error bound.
Of randomly selected adults, identified themselves as manual laborers, identified themselves as non-manual wage earners, identified themselves as midlevel managers, and identified themselves as executives. In the survey, of manual laborers preferred trucks, of non-manual wage earners preferred trucks, of mid-level managers preferred trucks, and of executives preferred trucks
The sampling error given in the survey is . Explain what the means.
Using the same p鈥� and level of confidence, suppose that n were increased to 100. Would the error bound become larger
or smaller? How do you know?
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