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Chapter 7: Q.1.2 (page 417)
On a New York–to–Denver flight, of the passengers were selected for random security screening before boarding. According to the Transportation Security Administration, of passengers at this airport are chosen for random screening.
ounces is the statistic.
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AP2.22. A health worker is interested in determining if omega-fish oil can help reduce cholesterol in adults. She obtains permission to examine the health records of people in a large medical clinic and classifies them
according to whether or not they take omega-fish oil. She also obtains their latest cholesterol readings and finds that the mean cholesterol reading for those who are taking omega-fish oil is points lower than the mean for the group not taking omega- fish oil.
(a) Is this an observational study or an experiment? Explain.
(b) Do these results provide convincing evidence that taking omega- fish oil lowers cholesterol?
(c) Explain the concept of confounding in the context of this study and give one example of a possible confounding variable.
In the language of government statistics, you are “in the labor force” if you are available for work and either working or actively seeking work. The unemployment rate is the proportion of the labor force (not of the entire population) who are unemployed. Here are data from the Current Population Survey for the civilian population aged years and over in a recent year. The table entries are counted by thousands of people.
Unemployment () Find the unemployment rate for people with each level of education. How does the unemployment rate change with education?
When people order books from a popular online source, they are shipped in standard-sized boxes. Suppose that the mean weight of the boxes ispounds with a standard deviation of pounds, the mean weight of the packing material is pounds with a standard deviation of 0.1 pounds, and the mean weight of the books shipped is pounds with a
standard deviation of pounds. Assuming that the weights are independent, what is the standard deviation of the total weight of the boxes that are shipped from this source?
(a)
(b)
(c)
(d)
(e)
Mars, Incorporated, says that the mix of colors in its M&M’S® Milk Chocolate Candies is blue, orange, green,yellow, red, and brown. Assume that the company’s claim is true. We want to examine the proportion of orange M&M’S in repeated random samples of candies. Which of the graphs that follow could be the approximate sampling distribution of the statistic? Explain your choice
Identify the population, the parameter, the sample, and the statistic in each setting.
Stop smoking! A random sample of people who signed a card saying they intended to quit smoking were contacted nine months later. It turned out that of the sampled individuals had not smoked over the past six months.
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