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Chapter 1: Q10BSC (page 1)
Determine whether the sampling method appears to be sound or is flawed.
Clinical Trials. Researchers at Yale University conduct a wide variety of clinical trials by using subjects who volunteer after reading advertisements soliciting paid volunteers.
The sampling method is flawed.
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What鈥檚 Wrong? In Exercises 25鈥�28, identify what is wrong.
The electronic cigarette maker V2 Cigs sponsored a poll showing that 55% of
smokers surveyed say that they feel ostracized 鈥渟ometimes,鈥� 鈥渙ften,鈥� or 鈥渁lways.鈥�
Health SurveyIn a survey of 1020 adults in the United States, 44% said that they wash their hands after riding public transportation (based on data from KRC Research).
a. Identify the sample and population.
b. Is the value of 44% a statistic or parameter?
c. What is the level of measurement of the value of 44%? (nominal, ordinal, interval, ratio)
d. Are the numbers of subjects in such surveys discrete or continuous?
Determine whether the given source has the potential to create a bias in a statistical study.
Physicians Committee for Responsible Medicine. The Physicians Committee for Responsible Medicine tends to oppose the use of meat and dairy products in our diets and that organization has received hundreds of thousands of dollars in funding from the Foundation to Support Animal Protection.
What鈥檚 Wrong? In Exercises 25鈥�28, identify what is wrong.
Potatoes In a poll sponsored by the Idaho Potato Commission, 1000 adults were asked to select their favorite vegetables, and the favorite choice was potatoes, which were selected by 26% of the respondents.
In Exercises 29鈥�36, answer the given questions, which are related to percentages.
Percentages in Negotiations When the author was negotiating a contract for the faculty and administration at a college, a dean presented the argument that if faculty receive a 4% raise and administrators receive a 4% raise, that鈥檚 an 8% raise and it would never be approved. What鈥檚 wrong with that argument?
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