Statistical Sciences 2244A/B Chapter Notes - Chapter 2: Quartile, Interquartile Range, Algebraic Operation
5 Mar 2014
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Center: representative or average value that indicates where middle of data set is located. Variation: measure of amount data values vary among themselves. Distribution: nature or shape of distribution of data (bell-shaped, uniform, skewed) Outliers: sample values that lie very far from vast majority of other sample values. Time: changing characteristics of data over time. Critical thinking and interpretation: going beyond formulas - Descriptive statistics: objective is to summarize or describe important characteristics of a. Inferential statistics: when we use sample data to make inferences (or generalizations) set data about population. Frequency distributions list data values (individually, or by groups of intervals) along with corresponding frequencies (or counts) Frequency for particular class is number of original values that fall into that class. Standard terms for discussing frequency distributions are: Lower class limits: smallest numbers that can belong to different classes. Upper class limits: largest numbers that can belong to different classes.
