Ch04+Lecture

# Ch04+Lecture - CHAPTER 4 Probabilities and Research The...

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CHAPTER 4 Probabilities and Research: The Risks and Rewards of Scientific Sampling

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Samples and Their Populations: Why Statisticians Are Stingy! > Decision making The risks and rewards of sampling
Risks 1. The sample might not represent the larger population. 2. We might not know that the sample is misleading. 3. We might reach inaccurate conclusions. 4. We might make decisions based on this bad information.

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Rewards 1. The sample represents the larger population. 2. We increase our level of confidence in our own findings. 3. We reach accurate conclusions at a very low cost. 4. We remain open-minded because we know samples can mislead us. 5. We make wiser decisions based on the available evidence.
Random sampling An equal chance of being selected

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Variations on random sampling Cluster sampling Stratified sampling Convenience Why would you use these instead of full random sampling?
Check Your Learning Was random assignment used? Could it have been? 1. A health psychologist examined whether postoperative recovery time was less among patients who received counseling prior to surgery than among those who did not. 2. A clinical psychologist studied whether people with diagnosed personality disorder were more likely to miss therapy appointments than were people without diagnosed personality disorders.

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## This note was uploaded on 09/30/2011 for the course PSY 3301 taught by Professor Staff during the Spring '08 term at Texas State.

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Ch04+Lecture - CHAPTER 4 Probabilities and Research The...

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