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Chapter 8: Q 82. (page 544)
You have an SRS of observations from a large population. The distribution of sample values is roughly symmetric with no outliers. What critical value would you use to obtain a confidence interval for the mean of the population?
a.
b.
c.
d.
e.
Option (e) is correct.
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Check them all Determine if the conditions are met for constructing a confidence interval for the population mean in each of the following settings.
a. How much time do students at your school spend on the Internet? You collect data from the members of your AP Statistics class and calculate the mean amount of time that these students spent on the Internet yesterday.
b. Is the real-estate market heating up? To estimate the mean sales price, a realtor in a large city randomly selected home sales from the previous months in her city. These sales prices are displayed in the boxplot.
Student body totals Use your interval from Exercise 40 to construct and interpret a confidence interval for the total number of students at the school that the student body president can identify by name. Then use your interval to evaluate the president鈥檚 claim.
How confident? The figure shows the result of taking SRSs from a Normal population and constructing a confidence interval for the population mean using each sample. Which confidence level鈥�鈥攄o you think was used? Explain your reasoning.
Video games A Pew Research Center report on gamers and gaming
estimated that of U.S. adults play video games on a computer, TV, game console, or portable device such as a cell phone. This estimate was based on a random sample of U.S. adults. Construct and interpret a confidence interval for the proportion of all U.S. adults who play video games.
California鈥檚 traffic People love living in California for many reasons, but traffic isn鈥檛 one of them. Based on a random sample of employed California adults, a confidence interval for the average travel time to work for all employed California adults is minutes to minutes.
a. Interpret the confidence level.
b. Name two things you could do to reduce the margin of error. What drawbacks do these actions have?
c. Describe how non response might lead to bias in this survey. Does the stated margin of error account for this possible bias?
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