STATS 13 Chapter Notes - Chapter Sumary 1-6, 10: Bar Chart, Unimodality, Scatter Plot
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If a- = th t n sangh population. F- (cid:8869) nueuselhe t - distribution instead of null because it has thicker tails t the degrees of freedom oflhltdlstniblltion men - i. 420xsanfputl. sampugizep. in not skuld distribution: double sided test, Pie: it (cid:12200) hi-fi i sstafffif. it/ifta. tonobe8rmuaofiinsne:ls"amipye"sina. in, e . Manabu y , - y, t-hi-m-0-s. is. se . Pit rsampusiun. lv ilfattnalanrdtfeuduatnnion,n useful definitions: variability hour far does the data spread- measured mgfanmdaq. gg. " shape unimodal ? bimodal? general shape: centers - mode ifskewed. 1- mean if nott: unusual observations "outliers " (data points every far from center) t the mean is not resistant to outliers the median is resistant to outliers. So off f ( skewed: symethic - use mean as center. Distributions dot plot i i variable: each dot represents an observational unit, shows variability, modes, shape histogram, usedfor quantitative data single namable. K quantitative namable internals bar chart: used for qualitative data single variable oez .
