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Chapter 8: Q.91 (page 483)
In one complete sentence, explain what the interval means.
We estimate the proportion of girls, ages 8 to 12, in a starting ice-skating lesson at the Ice Chalet to be between 72% and 88% with 92% confidence.
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Using the same mean, standard deviation, and level of confidence, suppose that n were 69 instead of 25. Would the error bound become larger or smaller? How do you know?
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.
We are interested in finding the 95% confidence interval for the percent of executives who prefer trucks. Define random variables X and P鈥� in words.
Construct a confidence interval for the population mean weight of newborn elephants. State the confidence interval, sketch the graph and calculate the error bound.
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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In one complete sentence, explain what the interval means.
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