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Chapter 1: Q 1.10. (page 7)

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).

Short Answer

Expert verified

The given study is inferential.

Step by step solution

01

Step 1. Given information.

The given statement is:

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.

02

Step 2. Classify the given study as either descriptive or inferential.

The given table provides data about the estimates of percentages of non-medical drug use based on different types of drugs and age groups for the US for the years 2003 and 2008.

The percentages are based on sample data.

Therefore, the given study involves inferential statistics.

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Most popular questions from this chapter

Element Hunters. In the article "Element Hunters" (National Geographic, Vol. 233, No. 5, pp. 112-120), R. Dunn reports about the search for new undiscovered elements. Since 1940, scientists have been synthesizing elements one by one. The first was neptunium (Np), element number 93. There are, as of this writing, a total of 26 new synthetic elements. The following table provides their element numbers and symbols.

(a) Suppose that you decide to take a simple random sample of eight of these new elements. Use Table I in Appendix A to obtain eight random numbers that you can use to specify your sample.

(b) If you have access to a random-number generator, use it to solve part (a).

The members of a population have been numbered 1-500. A sample of size 10 is to be taken from the population, using stratified random sampling with proportional allocation. The strata are of sizes 200, 150, and 150, where stratum #1 consists of the members of the population numbered 1-200, stratum #2 consists of the members of the population numbered 201-350, and so forth.

(a) Determine the sample sizes that will be taken from the strata.

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Medical Testing on Animals. In its Summer 2013 Animal Action Report, the National Anti-Vivisection Society stated that "59% of Americans between the ages of 18 and 29 oppose medical testing on animals." The percentage of 59% was computed from sample data.

(a). Identify the population under consideration.

(b). Identify the sample under consideration.

(c). Is the statement in quotes descriptive or inferential?

(d). If you wanted to make it clear that the percentage of 59% was computed from sample data, how would you rephrase the statement in quotes?

In simple random sampling, it is also true that each member of the population is equally likely to be selected, the chance for each member being equal to the sample size divided by the population size.

(a) Under what circumstances is that fact also true for systematic random sampling? Explain your answer.

(b) Provide an example in which that fact is not true for systematic random sampling.

In Exercises 1.92-1.97, we present descriptions of designed experiments. In each case, identify the

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