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Stats 2510 Lec. 3 - Stats 2510 Section 2.3-2.4 Organizing...

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Stats 2510 Section 2.3-2.4 Organizing Quantitative Data For quantitative you will need frequency or relative frequency distribution Observations (1 individual measurement) grouped into classes or categories *Rule of thumb-5-20 class; no more than 20 Classes are treated as distinct values for constructing frequency and relative frequency distribution Each observation has to belong to exactly one class each (no overlap) All classes need to be the same in width Methods of Grouping: Single Value very few outcomes; discrete data and small number of distinct values Limit Grouping whole numbers; too many distinct values for single value grouping Cutpoint Grouping continuous data, usually expressed with decimals Terms to Know Lower Class smallest value in class Upper Class highest value in class Class Width lower limit of lower and upper classes Class Mark middle point or average ^^all four listed above can be cutpoint 3 Ways to Display Quantitative Data 1. Histogram analogous to a bar graph, but the bars touch each other
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