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Chapter 1: Q3-19BSC (page 1)

In Exercises 9鈥�20, identify which of these types of sampling is used: random, systematic, convenience, stratified, or cluster.

Literary Digest Poll In 1936, Literary Digest magazine mailed questionnaires to 10 million people and obtained 2,266,566 responses. The responses indicated that Alf Landon would win the presidential election. He didn鈥檛.

Short Answer

Expert verified

Convenience sampling

Step by step solution

01

Given information

The method used for gathering responses was through questionnaires that were mailed to 10 million people. Of these, 2,266,566 people responded.

02

Step 2:Identify the method of sampling

Convenience sampling collects data through the easiest method, based on any situation. These are collected from sources conveniently available.

In this case, mailing 10 million questionnaires and then analyzing the set of 2,266,566 responses to derive a conclusion is an example of convenience sampling.

Thus, the sampling method is convenience sampling.

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Most popular questions from this chapter

In Exercises 5鈥�20, assume that the two samples are independent simple random samples selected from normally distributed populations, and do not assume that the population standard deviations are equal. (Note: Answers in Appendix D include technology answers based on Formula 9-1 along with 鈥淭able鈥� answers based on Table A-3 with df equal to the smaller of n1鈭�1 and n2鈭�1.)

Are Quarters Now Lighter? Weights of quarters are carefully considered in the design of the vending machines that we have all come to know and love. Data Set 29 鈥淐oin Weights鈥� in Appendix B includes weights of a sample of pre-1964 quarters (n = 40, x = 6.19267 g, s = 0.08700 g) and weights of a sample of post-1964 quarters (n = 40, x = 5.63930 g, s = 0.06194 g).

a. Use a 0.05 significance level to test the claim that pre-1964 quarters have a mean weight that is greater than the mean weight of post-1964 quarters.

b. Construct a confidence interval appropriate for the hypothesis test in part (a).

c. Do post-1964 quarters appear to weigh less than before 1964? If so, why aren鈥檛 vending machines affected very much by the difference?

In Exercises 29鈥�36, answer the given questions, which are related to percentages.

Percentages in Advertising Continental Airlines ran ads claiming that lost baggage is 鈥渁n area where we鈥檝e already improved 100% in the past six months.鈥� What is wrong with this statement?

In Exercises 17鈥�20, refer to the sample of body temperatures (degrees Fahrenheit) in the table below. (The body temperatures are from a data set in Appendix B.)

Source: The listed body temperatures were obtained from Dr. Steven Wasserman, Dr. Philip Mackowiak, and Dr. Myron Levine, who were researchers at the University of Maryland. Is the source of the data likely to be biased?

In Exercises 21鈥�24, refer to the data in the table below. The entries are white blood cell counts (1000 cells,ML) and red blood cell counts (million cells,ML) from male subjects examined as part of a large health study conducted by the National Center for Health Statistics. The data are matched, so that the first subject has a white blood cell count of 8.7 and a red blood cell count of 4.91, and so on.

Conclusion: If we analyze the sample data and conclude that there is a correlation between white blood cell counts and red blood cell counts, does it follow that higher white blood cell counts are the cause of higher red blood cell counts?

In Exercises 29鈥�36, answer the given questions, which are related to percentages.

Percentages in Advertising: An ad for Big Skinny wallets included the statement that one of their wallets 鈥渞educes your filled wallet size by 50%鈥�200%.鈥� What is wrong with this statement?
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