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3-1-11 - Chapter 9 using Statistics to Answer Questions...

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3-1-11 Chapter 9 – using Statistics to Answer Questions Using Statistics to Answer Questions Statistics: branch of mathematics that involves the collection, analysis, and interpretation of data. o Two main branches of statistics assist you decisions in different ways Descriptive Statistics Procedures used to summarize a set of data Measure of central tendency: typical or representative score Variability: what spread exists in the scores Inferential Statistics Inferential statistics are used to analyze data after you have conducted an experiment to determine whether your independent variable had a significant effect. Scales of Measurement Measurement: the assignment of symbols to events according to a set of rules Scale of measurement: a set of measurement rules Nominal Scale o Events are assigned to categories; classify your research participants as men or women, as right-handed or left-handed, as Catholic or Protestant o Differences between categories are qualitative (kind) and not quantitative (degree) o
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