ch-10-sampling-

ch-10-sampling- - Sampling Demystified Research Methods for...

Info iconThis preview shows pages 1–12. Sign up to view the full content.

View Full Document Right Arrow Icon
Dr. G. Johnson, www.ResearchDe 1 Sampling Demystified Research Methods for Public Administrators Dr. Gail Johnson
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Dr. G. Johnson, www.ResearchDe 2 Steps in the Research Process Planning 1. Determining Your Questions 2. Identifying Your Measures and Measurement Strategy 3. Selecting a Research Design 4. Developing Your Data Collection Strategy Developing the Sampling Strategy 5. Identifying Your Analysis Strategy 6. Reviewing and Testing Your Plan 2
Background image of page 2
Dr. G. Johnson, www.ResearchDe 3 Why Sample? Sometimes it is possible to gather data from every file, every street, every person in the population of interest. When you can work with the entire population of files, streets, or people—we call it a census. Everyone is included because everyone counts
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Dr. G. Johnson, www.ResearchDe 4 Why Sample? When you have the resources to gather data from the entire population: that’s the gold standard. But—the world is not often organized in a way that makes this easy Often there is limited time, staff and money to gather data from the entire population. So researchers use samples
Background image of page 4
Dr. G. Johnson, www.ResearchDe 5 Why Sample? It requires a basic faith that the sample is a fairly accurate reflection of the population Think about it: Doctors don’t have to take all our blood in order to analyze it. They take a sample.
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Dr. G. Johnson, www.ResearchDe 6 Two Big Sampling Options Nonrandom Samples Quota Accidental Snow-ball Judgmental Convenience Random Samples Based on probability theory where: every item (person, transaction, street, house, whatever) has an equal chance of being selected
Background image of page 6
Dr. G. Johnson, www.ResearchDe 7 Option: Nonrandom Sampling Used when it is not possible or desirable to do a random sample Can be more focused: specifically chosen Select 6 executive directors: 3 men and 3 women Select all the transactions from the busiest day of the month Can observe traffic through town during rush hour (4:30-6pm Monday through Friday).
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Dr. G. Johnson, www.ResearchDe 8 Types of Nonrandom Samples Quota Set a specific number: we will interview 10 men and 10 women at the health clinic We will call 50 Democrats and 50 Republicans First come basis and once quota is met, we stop If we reach 50 Republicans, we then continue to dial for Democrats until we obtain the 50 quota.
Background image of page 8
Dr. G. Johnson, www.ResearchDe 9 Types of Nonrandom Samples Accidental—person on the street: think “Jay- walking” While chaotic, it does not meet the definition of random If I survey people outside the big box store on a Saturday morning, not everyone in the community will have had an equal chance of being selected
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Dr. G. Johnson, www.ResearchDe 10 Types of Nonrandom Samples Snow-ball This is useful when researchers really do not know who to include. So they start with the few they think have the information and then ask, “who else should we talk to?” Ideally, they continue until no new names are given
Background image of page 10
Dr. G. Johnson, www.ResearchDe
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 12
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 44

ch-10-sampling- - Sampling Demystified Research Methods for...

This preview shows document pages 1 - 12. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online