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Chapter 2 Notes (2)

Chapter 2 Notes (2) - Classification of variables Variables...

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Unformatted text preview: Classification of variables Variables Quantitative variables Categorical variables Continuous . variables Discrete varaibles S mmarizin dat usi tabl an h The methods used for summarizing and analyzing data depend on the type of the variable. Proportion and Percentages (relative frequencies) 0 Proportion of the observations that fall in a certain category frequency (count) of observations in that category . — total number of observations - Percentage of the observations that fail in a certain category = Proportion ' 100 frequency (count) of observations in that category X 100 — _____.______..__———— _ total number of observations Proportions and percentages are also called relative irequencies. . Fr uen T A frequency table is a listing of possible values for a variable, together with the number of observations for each value. out: A campus press polled a sample of 300 undergraduate students in order to study students’ attitude towards a proposed change in a dormitory regulation. Summary of results of an opinion poll is as follows. Response support 50% ~eutrau _tl—- oppose Total -m__ M..." _c_..._......r.,s......_ .m-M—Hmm“4mp-n.fl .. . A '- ‘ - - w -----s------¢ "tot'm-'?I1tItIV'ttlttmt'03: ::=3:1‘"'11$1le ...
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