Chapter 4: Q 2.1. (page 240)
Outline a completely randomized design for this experiment. Follow the model of
Figure 4.4.
Short Answer
Completely randomized design:
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Chapter 4: Q 2.1. (page 240)
Outline a completely randomized design for this experiment. Follow the model of
Figure 4.4.
Completely randomized design:
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A sampling at the mall You have probably seen the mall interviewer, approaching people passing by with a clipboard in hand. Explain why even a large sample of mall shoppers would not provide a trustworthy estimate of the current unemployment rate.
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.
Instant opinion A recent online poll posed the question 鈥淪hould female athletes be paid the same as men for the work they do?鈥欌 In all, said 鈥淵es,鈥欌 said 鈥淣o,鈥欌 and the remaining said, 鈥淒on鈥檛 know.鈥 In spite of the large sample size for this survey, we can鈥檛 trust the result. Why not?
Sampling gravestones The local genealogical society in Coles County, Illinois, has compiled records on all gravestones in cemeteries in the county from the years to Historians plan to use these records to learn about African Americans in Coles County鈥檚 history. They first choose an SRS of records to check their accuracy by visiting the actual gravestones.
(a) Explain how you would use technology or Table D to choose the SRS. Your description should be clear enough for a classmate to obtain your results.
(b) Use your method from (a) to choose the first gravestones.
When we take a census, we attempt to collect data from
(a) a stratified random sample.
(b) every individual selected in an SRS.
(c) every individual in the population.
(d) a voluntary response sample.
(e) a convenience sample.
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