Chapter 1: Q 1.27. (page 15)
Explain why a census is often not the best way to obtain information about a population.
A Census of the entire population is time-consuming, costly, impractical, or sometimes impossible.
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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.
Peanut Allergies. In the article " Food Allergy Advice May Be Peanuts " (Science News, Vol . 174, No. 12, pp . 8-9), N. Seppa reports that early exposure to peanuts seems to lessen the risk of nut allergy. Of 4000 Jewish children sampled in Britain, 1.85 % had peanut allergies; and of 4600 Jewish children sampled in Israel, where early peanut consumption is more common, 0.17 % had peanut allergies. The researcher chose Jewish children in both countries to limit genetic differences between groups.
(a) Is this study descriptive or inferential?
(b) Is this study observational or experimental?
In Exercises 1.7-1.12, classify each of the studies as either descriptive or inferential. Explain your answers.
Drug Use. The U.S. Substance Abuse and Mental Health Services Administration collects and publishes data on nonmedical drug use, by type of drug and age group, in National Survey on Drug Use and Health. The following table provides data for the years 2003 and 2008. The percentages shown are estimates for the entire nation based on information obtained from a sample (NA, not available).
Ideally, in cluster sampling, each cluster should the entire population.
Before planning and conducting a study to obtain information, what should be done?
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