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Chapter 8: Q. 37 (page 496)
Abstain from drinking Describe a possible source of error that is not included in the margin of error for the confidence interval in Exercise
There are possible sources of errors.
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Power lines and cancer Does living near power lines cause leukemia in children? The
National Cancer Institute spent 5 years and million gathering data on this question. The researchers compared children who had leukemia withwho did not. They went into the homes and actually measured the magnetic fields in children's bedrooms, in other rooms, and at the front door. They recorded facts about power lines near the family home and also near the mother's residence when she was pregnant. Result: no connection 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 show that living near power lines doesn't cause cancer? Explain.
confidence Find confidence interval using Table A or your calculator. Show your method.
63. Give it some gas! Computers in some vehicles calculate various quantities related to performance. One of these is fuel efficiency, or gas mileage, usually expressed as miles per gallon (mpg). For one vehicle
equipped in this way, the miles per gallon were recorded each time the gas tank was filled and the computer was then reset. Here are the mpg values for a random sample of of these records:
Construct and interpret a confidence interval for the mean fuel efficiency M for this vehicle.
AIDS and risk factors In the National AIDS
Behavioral Surveys sample of adult heterosexuals, had both received a blood transfusion and had a sexual partner from a group at high risk of A I D S. We want to estimate the proportion in the population who share these two risk factors.
The body mass index (BMI) of all American young women is believed to follow a Normal distribution with a standard deviation of about . How large a sample would be needed to estimate the mean BMI M in this population to within with confidence? Show your work.
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