QMS 230 Study Guide - Ogive, Minimax, Descriptive Statistics
28 Jan 2012
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Ch 1 sample& population plus stem & left. Primary:collected by us better decision accurate, costly time consume. Secondary:by someone else, cheap,fast, inaccurate. sample: subset of popu. Descriptive statistics: organize, summarize, present data in an informative way. Inferential: find out abt pop from a sample. Quantitative=numerical (interval(0 is something),ratio(the 0 is nothing) (discrete, continuous). Steam:6-13, 1 leaf at the beg n end must. Twice 1st 0-4 2nd 5-9 5 times 1st 0-1 2nd 2-3 only space, add a title, steam 10,100 Bar chart: the amount, frequency or percentage of values in category. Pie charts: best way to compare individual categories to the total. Frequencydt: divides quantitative data into ranges and records the count (frequency) of data in each range. Relative frequency: compare the class frequencies, in terms of fractional, decimal or percent form. (if percent is 8 that rf is 0. 08) rf=f/n(total number available) Cumulativefd: show a running total of the frequencies in the distribution.
