Statistical Sciences 1024A/B Chapter Notes - Chapter 1: Histogram
8 Apr 2013
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Individuals: the objects described by a set of data, also known as experimental units or sampling units (people, animals, things) e. g. students, dogs, foods. Variables: any characteristic of an individual, can take different values for different individuals e. g. age, height, weight, breed. Quantitative variables: something that can be counted or measured, then added, averaged, etc. (usually in a unit of measurement) Categorical variables: something that falls into one of several categories (hair color, blood type, yes or no answers, etc. ) Distribution of a variable: describes what values the variable take on and how often it does so. Distribution of a categorical variable: lists the categories and gives either the count or the percent of individuals who fall in each category. Bar graph: gives a visual display of the relative sizes of each category. Vertical axis: count (frequency) or relative frequency. Pie chart: gives a visual display of what fraction or percentage of the whole each category accounts for.
