Psychology 242 - UnivariateDescrStats

# Psychology 242 - UnivariateDescrStats - Univariate...

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Unformatted text preview: Univariate Descriptive Statistics Descriptive Research • The objective of univariate descriptive research is to describe a single psychological variable. Continuous Variable • Example: How stressed is an average psychology student at UIC? • To answer this question, we need to describe the distribution of scores. Example How stressed have you been in the last 2 weeks? Scale: 0 (not at all) to 10 (as stressed as possible) 4 7 7 7 8 8 7 8 9 4 7 3 6 9 10 5 7 10 6 8 7 8 7 8 7 4 5 10 10 0 9 8 3 7 9 7 9 5 8 5 0 4 6 6 7 5 3 2 8 5 10 9 10 6 4 8 8 8 4 8 7 3 7 8 8 8 7 9 7 5 6 3 4 8 7 5 7 3 3 6 5 7 5 7 8 8 7 10 5 4 3 7 6 3 9 7 8 5 7 9 9 3 1 8 6 6 4 8 5 10 4 8 10 5 5 4 9 4 7 7 7 6 6 4 4 4 9 7 10 4 7 5 10 7 9 2 7 5 9 10 3 7 2 5 9 8 10 10 6 8 3 How can we summarize this information effectively? Frequency Tables • A frequency table shows how often each value of the variable occurs Stress rating Frequency 10 14 9 15 8 26 7 31 6 13 5 18 4 16 3 12 2 3 1 1 2 Frequency Polygon • A visual representation of information contained in a frequency table • Align all possible values on the bottom of the graph (the x- axis) • On the vertical line (the y- axis), place a point denoting the frequency of scores for each value • Connect the lines • (typically add an extra value above and below the actual range of values—in this example, at –1 and 11) Shapes of Distributions...
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Psychology 242 - UnivariateDescrStats - Univariate...

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