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Chapter 1: Q. 15 (page 49)

For the following four exercises, determine the type of sampling used (simple random, stratified, systematic, cluster, or convenience).

A computer generates 100 random numbers, and 100 people whose names correspond with the numbers on the list are chosen.

Short Answer

Expert verified

For the given case simple random sampling is used.

Step by step solution

01

Introduction

Sampling is essentially the method involved with finding out about the populace in light of the example drawn from the number of inhabitants in interest. There are different strategies for choosing this example

02

Explanation

Simple random sampling testing is the one wherein every single unit of the populace has an equivalent possibility of being remembered for the example. The scientist haphazardly chooses the example utilizing different procedures like irregular number table, lottery strategy and so on.

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Most popular questions from this chapter

Studies are often done by pharmaceutical companies to determine the effectiveness of a treatment program. Suppose that a new AIDS antibody drug is currently under study. It is given to patients once the AIDS symptoms have revealed themselves. Of interest is the average (mean) length of time in months patients live once they start the treatment. Two researchers each follow a different set of 40 patients with AIDS from the start of treatment until their deaths. The following data (in months) are collected.

Researcher A:

3; 4; 11; 15; 16; 17; 22; 44; 37; 16; 14; 24; 25; 15; 26; 27; 33; 29; 35; 44; 13; 21; 22; 10; 12; 8; 40; 32; 26; 27; 31; 34; 29; 17; 8; 24; 18; 47; 33; 34

Researcher B:

3; 14; 11; 5; 16; 17; 28; 41; 31; 18; 14; 14; 26; 25; 21; 22; 31; 2; 35; 44; 23; 21; 21; 16; 12; 18; 41; 22; 16; 25; 33; 34; 29; 13; 18; 24; 23; 42; 33; 29

Determine what the key terms refer to in the example for Researcher A.

population

Seven hundred and seventy-one distance learning students at Long Beach City College responded to surveys in the 2010-11academic year. Highlights of the summary report are listed in Table 1.39.

a. What percent of the students surveyed do not have a computer at home?

b. About how many students in the survey live at least 16 miles from campus?

c. If the same survey were done at Great Basin College in Elko, Nevada, do you think the percentages would be the same? Why?

Is it possible for two experiments to be well run with similar sample sizes to get different data?

A scholarly article about response rates begins with the following quote:

“Declining contact and cooperation rates in random digit dial (RDD) national telephone surveys raise serious concerns about the validity of estimates drawn from such research.”[6]The Pew Research Center for People and the Press admits: “The percentage of people we interview – out of all we try to interview – has been declining over the past decade or more.”[7]

a. What are some reasons for the decline in response rate over the past decade?

b. Explain why researchers are concerned with the impact of the declining response rate on public opinion polls.

Table 1.26 contains the total number of deaths worldwide as a result of earthquakes from 2000 to 2012.

Use Table 1.26 to answer the following questions.

  1. What is the proportion of deaths between 2007 and 2012?
  2. What percent of deaths occurred before 2001?
  3. What is the percent of deaths that occurred in 2003 or after 2010?
  4. What is the fraction of deaths that happened before 2012?
  5. What kind of data is the number of deaths?
  6. Earthquakes are quantified according to the amount of energy they produce (examples are 2.1, 5.0, 6.7). What type of data is that?
  7. What contributed to the large number of deaths in 2010? In 2004? Explain.
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