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Chapter 1: Q 1.33. (page 15)
The inferential procedures discussed in this book are intended for use with only one particular sampling procedure. What sampling procedure is that?
Simple random sampling procedure.
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Ideally, in stratified sampling, the members of each stratum should be relative to the characteristic under consideration.
AVONEX and MS. An issue of Inside MS contained an article describing AVONEX (interferon beta-la), a drug used in the treatment of relapsing forms of multiple sclerosis (MS). Included in the article was a report on "... adverse events and selected laboratory abnormalities that occurred at an incidence of 2% or more among the 158 multiple sclerosis patients treated with 30 mcg of AVONEX once weekly by IM injection." In the study, 158 patients took AVONEX and 143 patients were given placebo.
(a) Is this study observational or is it a designed experiment?
(b) Identify the treatment group, control group, and treatments.
In sampling, explain why obtaining a representative sample is important.
The members of a population are numbered 1-4.
(a). List the 6 possible samples (without replacement) of size 2 from this population.
(b). If an SRS of size 2 is taken from the population, what are the chances of selecting 2 and 3? Explain your answer.
(c). Use Table I in Appendix A to obtain an SRS of size 2 from the population. Start at the single-digit number in line number 17 and column number 7, read down the column, up the next, and so on.
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 10 possible samples (without replacement) of size 3 that can be obtained from the population of five officials.
(b). If a simple random sampling procedure is used to obtain a sample of three officials, what are the chances that it is the first sample on your list in part (a)? the second sample? the tenth sample?
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