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chapter7 - Chapter 7 Probability and Samples PowerPoint...

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Chapter 7 Probability and Samples PowerPoint Lecture Slides Essentials of Statistics for the Behavioral Sciences Seventh Edition by Frederick J. Gravetter and Larry B. Wallnau
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Chapter 7 Learning Outcomes
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Concepts to review Random sampling (Chapter 6) Probability and the normal distribution (Chapter 6) z-Scores (Chapter 5)
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7.1 Samples and Population The location of a score in a sample or in a population can be represented with a z-score Researchers want to study whole samples rather than single scores Sample provides estimate of the population Tests involve transforming sample mean to a z-score
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Sampling Error Error does not indicate a mistake was made. Sampling error is the natural discrepancy, or the amount of error, between a sample statistic and its corresponding population parameter. Samples are variable ; no two samples are identical.
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7.2 Distribution of Sample Means Samples differ from each other The sample means differ from each other The distribution of sample means is the collection of sample means for all the possible random samples of a particular size ( n ) that can be obtained from a population.
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Sampling distribution Distributions in earlier chapters were distributions of sample scores. Distribution of sample means is a
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This note was uploaded on 04/08/2011 for the course PSY 216 taught by Professor Cynthiaingle during the Spring '11 term at KCTCS.

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chapter7 - Chapter 7 Probability and Samples PowerPoint...

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