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Chapter 8: Q 4. (page 506)
Reporting cheating What proportion of students are willing to report cheating by other students? A student project put this question to an SRS of undergraduates at a large university: 鈥淵ou witness two students cheating on a quiz. Do you go to the professor?鈥�
The proportion of students is
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Power lines and cancer Does living near power lines cause leukemia in
children? The National Cancer Institute spent years and million gathering data on this question. The researchers compared children who had leukemia with who did not. They went into the homes and measured the magnetic fields in children鈥檚 bedrooms, in other rooms, and at the front door. They recorded facts about power lines near the family home and also near the mother鈥檚 residence when she was pregnant. Result: No association between leukemia and exposure to magnetic fields of the kind produced by power lines was found.
a. Was this an observational study or an experiment? Justify your answer.
b. Does this study prove that living near power lines doesn鈥檛 cause cancer? Explain your answer.
Weeds among the corn Velvetleaf is a particularly annoying weed in cornfields. It produces lots of seeds, and the seeds wait in the soil for years until conditions are right for sprouting. How many seeds do velvetleaf plants produce? The histogram shows the counts from a random sample of plants that came up in a cornfield
when no herbicide was used. Determine if the Normal/Large Sample condition is met in this context.
Scientists collect data on the blood cholesterol levels (milligrams per deciliter of blood) of a random sample of laboratory rats. A confidence interval for the mean blood cholesterol level is to . Which of the following would cause the most worry about the validity of this interval?
a. There is a clear outlier in the data.
b. A stem plot of the data shows a mild right skew.
c. You do not know the population standard deviation .
d. The population distribution is not exactly Normal.
e. None of these are a problem when using a interval.
Selling online According to a recent Pew Research Center report, many
American adults have made money by selling something online. In a random sample of American adults, reported that they earned money by selling something online in the previous year. Assume the conditions for inference are met.
Determine the critical value for a confidence interval for a proportion.
b. Construct a confidence interval for the proportion of all American adults who
would report having earned money by selling something online in the previous year.
c. Interpret the interval from part (b).
The weights (in pounds) of three adult males are,and. What is the standard error of the mean for these data?
a.
b.
c.
d.
e.
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