# lec07 - STATISTICS 13 Lecture 7 Oct 8, 2010 Review...

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STATISTICS 13 Lecture 7 Oct 8, 2010

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Review properties of mean and standard deviation empirical Rule and Tchebysheff’s Theorem z-scores: percentiles, Q1, Q3 and IQR boxplots s x x z = score -
Bivariate Data When two variables are measured on a single experimental unit, the resulting data are called bivariate data Often the interest is in the relationship between the two variables Bivariate data can be described with – Graphs – Numerical Measures

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Graphs for Qualitative Variables When at least one of the variables is qualitative, you can use comparative pie charts or bar charts Example: A Gallup poll surveyed 250 women and 502 men to assess the importance of family life in the United States. The results shown in the table are responses to the question, “How would you rate the importance of having a good family life?” variable 1: person’s gender (M or F); variable 2: their response to the question (very important, somewhat important, very unimportant, no opinion) Very Important Somewhat important Very unimporta nt No opinion Female 229 16 0 5 Male 432 70 0 0
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## This note was uploaded on 10/06/2010 for the course NUT 10 taught by Professor Lizapplegates during the Fall '10 term at UC Merced.

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lec07 - STATISTICS 13 Lecture 7 Oct 8, 2010 Review...

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