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Chapter 1: Q 1.29. (page 15)
In sampling, explain why obtaining a representative sample is important.
A representative sample is important to reflect as closely as possible the relevant attributes of the entire population under study.
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University Parking Facilities. During one year, a university wanted to gauge the sentiment of the people using the university's parking facilities. Each of the 8493 people that used the parking facilities had a sticker with a unique number between 1 and 8493. The university committee on parking decided to sample 30 users of the parking facilities and obtain their views on those facilities. The committee selected a number at random between 1 and 283 and got the number 10. The people interviewed were the ones whose stickers had numbers 10, 293, 576, ..., 8217. What type of sampling design was used by the university committee on parking? Explain your answer.
Explain why a census is often not the best way to obtain information about a population.
Big-Banks Break-up. A nationwide survey of 1000 U.S. adults, conducted in March 2013 by Rasmussen Reports (field work by Pulse Opinion Research, LLC), found that 50% of respondents favored a plan to break up the 12 megabanks, which then controlled about 69% of the banking industry.
(a) Identify the population and sample for this study.
(b) Is the percentage provided a descriptive statistic or an inferential statistic? Explain your answer.
Regarding simple random sampling:
(a) What is simple random sampling?
(b) What is a simple random sample?
(c) Identify two forms of simple random sampling and explain the difference between the two.
Oklahoma State Officials. The five top Oklahoma state officials are displayed in Table 1.2 on page 11. Use that table to solve the following problems.
(a) List the possible samples of size 1 that can be obtained from the population of five officials.
(b) What is the difference between obtaining a simple random sample of size 1 and selecting one official at random?
(c) List the possible samples (without replacement) of size 5 that can be obtained from the population of five officials.
(d) What is the difference between obtaining a simple random sample of size 5 and taking a census of the five officials?
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