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Chapter 1: Q3-27BSC (page 1)

In Exercises 21鈥�28,determine whether the study is an experiment or an observational study, and then identify a major problem with the study.

Crime Research A sociologist has created a brief survey to be given to 2000 adults randomly selected from the U.S. population. Here are her first two questions: (1) Have you ever been the victim of a felony crime? (2) Have you ever been convicted of a felony?

Short Answer

Expert verified

The study is observational.

As the survey operates on felony crimes, the respondents may have recorded dishonest answers under the pressure of looking socially desirable. Therefore, the results based on them can be inaccurate.

Step by step solution

01

Given information

A study is conducted based on a survey of 2000 adults. Answers to two of the questions are recorded and analyzed.

02

Observational study and experimental study

Observational study: In this kind of study, inferences are made using the sample without affecting any change in the members of the sample. These studies try to correlate the two effects under consideration without validating the relationship.

Experimental study: In this kind of study, a treatment/factor is allocated to one group of the sample, and the relationship between the two effects under consideration is analyzed. The members of the sample are modified to ease the process of drawing conclusions in the study.

03

Identification of the type of study

As the answers of the sample of 2000 adults, who are a part of the survey, are observed and recorded without inducing any changes, the study isobservational.

04

Identification of the problem

Voluntary responses in a survey result in false conclusions because the respondents鈥� integrity can be questioned.

Since the respondents鈥� answers can befalse/biased, so in order to look desirable to the people who are conducting the survey, the results based on this study will not be favourable.

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Most popular questions from this chapter

Colleges in United States Currently, there are 4612 colleges in the United States, and the number of full-time students is 13,203,477.

a. Are the numbers of full-time students at different colleges discrete or continuous?

b. What is the level of measurement for the numbers of full-time students at colleges? (nominal, ordinal, interval, ratio)

c. What is wrong with surveying college students by mailing questionnaires to 10,000 of them who are randomly selected?

d. If we randomly select 50 full-time college students in each of the 50 states, what type of sample is obtained? (random, systematic, convenience, stratified, cluster)

e. If we randomly select four colleges and survey all of their full-time students, what type of sample is obtained? (random, systematic, convenience, stratified, cluster)

In Exercises 21-28,determine which of the four levels of measurement (nominal, ordinal, interval, ratio) is most appropriate.

M&MsColours of M&Ms (red, orange, yellow, brown, blue, green) are listed in Data Set 27 鈥淢&M Weights鈥� in Appendix B.

Parameter and Statistic In a Harris Interactive survey of 2276 adults in the United States, it was found that 33% of those surveyed never travel using commercial airlines. Identify the population and sample. Is the value of 33% a statistic or a parameter?

In Exercises 9鈥�12, determine whether the sampling method appears to be sound or is flawed.

Smartphone Usage In a survey of smartphone ownership, the Pew Research Center randomly selected 1006 adults in the United States.

Determine whether the sampling method appears to be sound or is flawed.

Clinical Trials. Researchers at Yale University conduct a wide variety of clinical trials by using subjects who volunteer after reading advertisements soliciting paid volunteers.
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