6.Descriptive Stats

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Descriptive Statistics Purpose of descriptive statistics Frequency distributions Measures of central tendency Measures of dispersion Statistics as a Tool for LIS Research Importance of statistics in research Summarize observations to provide answers to research questions and hypotheses Make general conclusions based on speciﬁc study observations Objectively evaluate reliability of study conclusions ©Gary Geisler ♦ Simmons College ♦ LIS 403 ♦ Spring, 2004 Statistics as a Tool for LIS Researc
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Descriptive Statistics Purpose of descriptive statisticsFrequency distributionsMeasures of central tendency Measures of dispersion  © Gary Geisler ♦ Simmons College ♦ LIS 403 ♦ Spring, 2004 Statistics as a Tool for LIS Research Importance of statistics in research Summarize observations to provide answers to research questions andhypothesesMake general conclusions based on speci ﬁ c study observationsObjectively evaluate reliability of study conclusions  © Gary Geisler ♦ Simmons College ♦ LIS 403 ♦ Spring, 2004 Statistics as a Tool for LIS Research Main purposes of statistics in research Describe central point in a set of data/observationsDescribe how broad, diversi ﬁ ed, or variable the data in a set isIndicate whether spec ﬁ c features of a set of data are related, and how closely they are relatedIndicate probability of features of data being in ﬂ uenced by factorsother than simply chance  © Gary Geisler ♦ Simmons College ♦ LIS 403 ♦ Spring, 2004 Statistics as a Tool for LIS Research Two main types or branches of statistics Descriptive statistics Characterizing or summarizing data setPresenting data in charts and tables to clarify characteristicsNo inference, just describing a particular group of observations Inferential statistics Using sample data to make generalizations (  inferences  ) or estimatesabout a populationStatements made in terms of probability
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