1a_Introduction_Outline

1a_Introduction_Outline - 1 2 3 Psychological Statistics...

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Psychological Statistics PSY 207A Fall 2010 Introduction Objectives You should be able to . . . • Define statistics –and tell the difference between descriptive and inferential statistics • Tell the difference between populations and samples parameters and statistics You should be able to . . . • Define data –and tell the difference between qualitative and quantitative data –and tell the difference between discrete and continuous data You should be able to . . . • Tell the difference between variables and constants independent and dependent variables control and experimental conditions experimental and correlational studies You should be able to . . . • Define the four scales of measurement and tell the difference among them: 1 2 3 4 5 6
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1 . nominal 2. ordinal 3. interval 4. ratio Statistics • A set of tools used to organize, describe, and analyze numerical observations • These tools are used to describe and analyze numerical observations from populations and samples Populations and Samples Population • The set of all individuals of interest –depressed humans Populations and Samples Population • The set of all individuals of interest –depressed humans Populations and Samples Population • The set of all individuals of interest –depressed humans Sample • A subset of a population –those individuals in our research study Populations and Samples Population • The set of all individuals of interest –depressed humans Sample 7 8 9 10 11
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• A subset of a population –those individuals in our research study Populations and Samples • We use different terms to refer to the statistics used for populations and samples Parameters and Statistics Parameter • A numerical description of a characteristic of a population –average # of hours of sleep for entire population of depressed individuals Statistic • A numerical description of a characteristic of a sample –average # of hours of sleep for those in our study Parameters and Statistics • The term statistics is used to refer to the whole set of tools we use to describe and analyze numerical observations • A statistic refers to a specific tool applied to samples –E.g., an average for a sample
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1a_Introduction_Outline - 1 2 3 Psychological Statistics...

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