Statistical Sciences 1024A/B Lecture Notes - Lecture 1: Bar Chart, Statistical Unit, Frequency Distribution
14 May 2016
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Document Summary
Individuals- the objects described by a set of data. Also called an experimental unit or sampling unit depending on the context: examples: students, m&ms, dogs. Something that can be counted or measured for each individual and then added, subtracted, averaged, etc. , across individuals in the population: example: height, age, blood cholesterol level, number of credit cards you own. Something that falls into one of several categories. What can be counted is the count or proportion of individuals in each category: example: blood type (a, b, ab, o), hair colour, ethnicity, whether you paid income tax last tax year, distribution of a variable. Distribution of a quantitative variable: tells us what values it takes and how often it takes them. Step 1: examine each variable independently, then study the relationships among the variables. Step 2: begin with a graph, then add numerical summaries of specific aspects of the data: types of graphs.
