SOAN 2120- Final Exam Guide - Comprehensive Notes for the exam ( 32 pages long!)

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Whatever comes before the decimal point is stem. 3 (stem) . 94 (leaf) stem=vertical on the table lead=horizontal. Too many of them? two rows for each stems, two rows of leaves. Example: 0 to 4 and 5 to 9 population = parameters sample = statistics measures of central tendency. Mean, median and mode mean: average of the data set, take all the data, add it up and divide it up to however many data there are population mean: greek letter lower case letter u. Every observation can be converted to a z-score. Z-scores can indicate whether an observation is statistically significantly different from the mean. Negative = less than the mean vs positive = more than the mean. A x-s(cid:272)ore tells us ho(cid:449) (cid:373)a(cid:374)y sd"s a(cid:374) o(cid:271)ser(cid:448)atio(cid:374) is fro(cid:373) the (cid:373)ea(cid:374) 95% all observations plus or minus 2 standard deviations of the mean. Then we calculate a variance/ standard deviation.

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