Chapter 4: Q 2.2. (page 240)
Describe how you would carry out the random assignment. Provide enough detail that a classmate could implement your procedure.
Short Answer
All classes are given to candidates at random.
Chapter 4: Q 2.2. (page 240)
Describe how you would carry out the random assignment. Provide enough detail that a classmate could implement your procedure.
All classes are given to candidates at random.
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Get started for freeInstant opinion A recent online poll posed the question “Should female athletes be paid the same as men for the work they do?’’ In all, said “Yes,’’ said “No,’’ and the remaining said, “Don’t know.” In spite of the large sample size for this survey, we can’t trust the result. Why not?
Archaeologists plan to examine a sample of -meter square plots near an ancient Greek city for artifacts visible in the ground. They choose separate random samples of plots from the floodplain, coast, foothills, and high hills. What kind of sample is this?
(a) A cluster sample
(b) A convenience sample
(c) A simple random sample
(d) A stratified random sample
(e) A voluntary response sample
Effects of binge drinking A common definition of “binge drinking” is or more drinks at one sitting for men and or more for women. An observational study
finds that students who binge drink have lower average GPA than those who don’t. Identify a lurking variable that may be confounded with the effects of binge drinking. Explain how confounding might occur.
Seat belt uses A study in El Paso, Texas, looked at seat belt use by drivers. Drivers were observed at randomly chosen convenience stores. After they left their cars, they were invited to answer questions that included questions about seat belt use. In all, 75% said they always used seat belts, yet only 61.5% were wearing seat belts when they pulled into the store parking lots.16 Explain the reason for the bias observed in responses to the survey. Do you expect bias in the same direction in most surveys about seat belt use?
Wording bias Comment on each of the following as a potential sample survey question. Is the question clear? Is it slanted toward the desired response?
(a) “Some cell phone users have developed brain cancer. Should all cell phones come with a warning label explaining the danger of using cell phones?”
(b) “Do you agree that a national system of health insurance should be favored because it would provide health insurance for everyone and would reduce
administrative costs?”
(c) “In view of escalating environmental degradation and incipient resource depletion, would you favor economic incentives for recycling of resource-intensive consumer goods?”
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