Chapter 7, Sampling and Sampling Distributions Video Solutions, Business Statistics - For Contemporary Decision Making

Problem 1

Develop a frame for the population of each of the following research projects.
a. Measuring the job satisfaction of all union employees in a company
b. Conducting a telephone survey in Utica, New York, to determine the level of interest in opening a new hunting and fishing specialty store in the mall
c. Interviewing passengers of a major airline about its food service
d. Studying the quality-control programs of boat manufacturers
e. Attempting to measure the corporate culture of cable television companies

Harsh Gadhiya

Numerade Educator

01:40

Problem 2

Make a list of 25 people you know. Include men and women, various ages, various educational levels, and so on. Number the list and then use the random number list in Table 7.1 to select six people randomly from your list. How representative of the population is the sample? Find the proportion of men in your population and in your sample. How do the proportions compare? Find the proportion of 20-year-olds in your sample and the proportion in the population. How do they compare?

James Kiss

Numerade Educator

00:50

Problem 3

Use the random numbers in Table A.1 of Appendix A to select 10 of the companies from the 30 companies listed in Table 7.2. Compare the types of companies in your sample with the types in the population. How representative of the population is your sample?

Kari Hasz

Numerade Educator

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Problem 4

For each of the following research projects, list three variables for stratification of the sample.
a. A nationwide study of motels and hotels is being conducted. An attempt will be made to determine the extent of the availability of online links for customers. A sample of motels and hotels will be taken.
b. A consumer panel is to be formed by sampling people in Michigan. Members of the panel will be interviewed periodically in an effort to understand current consumer attitudes and behaviors.
c. A large soft-drink company wants to study the characteristics of its U.S. bottlers, but the company does not want to conduct a census.
d. The business analytics bureau of a large university is conducting a project in which the bureau will sample paper-manufacturing companies.

Rashmi Sinha

Numerade Educator

02:04

Problem 5

In each of the following cases, the variable represents one way that a sample can be stratified in a study. For each variable, list some strata into which the variable can be divided.
a. Age of respondent (person)
b. Size of company (sales volume)
c. Size of retail outlet (square feet)
d. Geographic location
e. Occupation of respondent (person)
f. Type of business (company)

Christopher Stanley

Numerade Educator

00:56

Problem 6

A city's telephone book lists 100,000 people. If the telephone book is the frame for a study, how large would the sample size be if systematic sampling were done on every 200th person?

Sheryl Ezze

Numerade Educator

01:05

Problem 7

If every 11th item is systematically sampled to produce a sample size of 75 items, approximately how large is the population?

Prabhakar Kumar

Numerade Educator

01:44

Problem 8

If a company employs 3500 people and if a random sample of 175 of these employees has been taken by systematic sampling, what is the value of $k$ ? The researcher would start the sample selection between what two values? Where could the researcher obtain a frame for this study?

Harsh Gadhiya

Numerade Educator

00:59

Problem 9

7.9. For each of the following research projects, list at least one area or cluster that could be used in obtaining the sample.
a. A study of road conditions in the state of Missouri
b. A study of U.S. offshore oil wells
c. A study of the environmental effects of petrochemical plants west of the Mississippi River

Ronald Prasad

Numerade Educator

02:26

Problem 10

Give an example of how judgment sampling could be used in a study to determine how district attorneys feel about attorneys advertising on television.

Jennifer Stoner

Numerade Educator

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Problem 11

Give an example of how convenience sampling could be used in a study of Fortune 500 executives to measure corporate attitude toward paternity leave for employees.

Rashmi Sinha

Numerade Educator

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Problem 12

Give an example of how convenience sampling could be used in a study of Fortune 500 executives to measure corporate attitude toward paternity leave for employees.

Rashmi Sinha

Numerade Educator