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Chapter 4: Q. T4.2 (page 289)
You want to take a simple random sample (SRS) of of thestudents who live in
a dormitory on campus. You label the students in alphabetical order. In the
table of random digits, you read the entries
The first three students in your sample have labels.
The correct option is:
(e
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A simple random sample of 1200 adult Americans is selected, and each person is asked
the following question: 鈥淚n light of the huge national deficit, should the government at this
time spend additional money to send humans to Mars?鈥� Only 39% of those responding
answered 鈥淵es.鈥� This survey
a. is reasonably accurate because it used a large simple random sample.
b. needs to be larger because only about 24 people were drawn from each state.
c. probably understates the percent of people who favor sending humans to Mars.
d. is very inaccurate but neither understates nor overstates the percent of people who favor
sending humans to Mars. Because simple random sampling was used, it is unbiased.
e. probably overstates the percent of people who favor sending humans to Mars.
More testosterone Refer to Exercise 56. Could blinding be used in this experiment? Explain your reasoning. Why is blinding an important consideration in this context?
More oil and inflammation Refer to Exercise 55. Could blinding be used in this experiment? Explain your reasoning. Why is blinding an important consideration in this context?
Parking on campus The director of student life at a university wants to estimate the proportion of undergraduate students who regularly park a car on campus. Describe how to select a stratified random sample of approximately students. Explain your choice of strata and why stratified random sampling might be preferred in this context.
Supplements for testosterone -As men age, their testosterone levels gradually decrease. This may cause a reduction in energy, an increase in fat, and other undesirable changes. Do testosterone supplements reverse some of these effects? A study in the Netherlands assigned men aged to with low or low-normal testosterone levels to either a testosterone supplement or a placebo.
Explain why it was necessary to include a control group in this experiment.
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