Statistics

# Statistics - Chapter 12 Understanding Research Results...

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Chapter 12: Understanding Research Results: Description and Correlation Statistics – describe data, used to make inferences and draw conclusions *Researcher needs to create an operational definition of the variable and devise 2 or more levels 3 basic ways of describing the results i. Comparing group percentages ii. Correlating scores of individuals on 2 variables iii. Comparing group means Frequency distribution Graphing frequency distributions – frequency distribution indicates the number of individuals who receive each possible score on a variable (pie charts, bar graphs, frequency polygons, histograms) Descriptive statistics Descriptive statistics – allow researchers to make precise statements about the data, 2 statistics are needed to describe data 1. Describe the central tendency 2. Variability – how wide the distribution of scores is spread Central tendency – tell us what the sample is as a whole or average (Mean – interval or ratio, Median – ordinal, Mode – nominal)

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• Spring '08
• QUINTON,WJ
• Psychology, Statistics, Correlation, Correlation and dependence, Pearson product-moment correlation coefficient, Spearman's rank correlation coefficient, *researcher

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