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Chapter 4: Q 39. (page 230)
an SRS of students from your class to ask where they use a computer for the online exercises. You label the students You enter the table
of random digits at this line:
Your SRS contains the students labeled
The correct option is
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Wake-up call Do people naturally wake up earlier when they set an alarm before going to sleep? Justin decides to conduct his own experiment to find out. On Friday and Saturday nights, he doesn鈥檛 set the alarm before going to bed. On Monday and Tuesday, he sets the alarm for a.m. Justin records the time when he wakes up each day and then compares his average wake-up time with and without the alarm.
(a) Identify any flaws you see in the proposed design for this experiment.
(b) Describe how you would design the experiment. Explain how your design addresses each of the problems you identified in (a).
High-speed Internet Laying fiber-optic cable is expensive. Cable companies want to make sure that, if they extend their lines out to less dense suburban
or rural areas, there will be sufficient demand and the work will be cost-effective. They decide to conduct a survey to determine the proportion of households in a rural subdivision that would buy the service. They select a sample of 5 blocks in the subdivision and survey each family that lives on those blocks.
(a) What is the name for this kind of sampling method?
(b) Suppose there are 65 blocks in the subdivision. Use technology or Table D to select 5 blocks to be sampled. Explain your method clearly.
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
Customer satisfaction A department store mails a customer satisfaction survey to people who make credit card purchases at the store. This month,
people made credit card purchases. Surveys are mailed to of these people, chosen at random, and people return the survey form. Identify the
population and the sample.
Pain relief study Fizz Laboratories, a pharmaceutical company, has developed a new drug for relieving chronic pain. Sixty patients suffering from arthritis and needing pain relief are available. Each patient will be treated and asked an hour later, 鈥淎bout what percent of pain relief did you experience?鈥�
(a) Why should Fizz not simply administer the new drug and record the patients鈥� responses?
(b) Should the patients be told whether they are getting the new drug or a placebo? How would this knowledge probably affect their reactions?
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