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# Stat 243

What is Statistics? Statistics is a way of reasoning, along with a collection of tools and methods, designed to help us. collecting, organizing and interpretation of data.
What are statistics? Statistics ( plural) are particular calculations made from data.
Difference between a parameter and statistic? Parameter is any characteristic about a population. Statistic is any characteristic about the sample.
Discrete data assume values that can be counted. (age in years, number of family members)
Continuous data can assume all values between any two specific values. (Usually measurements.) Height, Weight, Time, Income
Context The context ideally tells Who was measured, What was measured, How the data were collected, Where the data were collected, and When and Why the study was performed.
Data Systematically recorded information, whether numbers or labels, together with its context .
Data table An arrangement of data in which each row represents a case and each column represents a variable.
Case A case is an individual about whom or which we have data.
Sample The cases we actually examine in seeking to understand the much larger population.
Population All the cases we wish we knew about.
Variable A variable holds information about the same characteristic for many cases.
Units A quantity or amount adopted as a standard of measurement, such as dollars, hours, or grams.
Categorical variable A variable that names categories ( whether with words or numerals) is called categorical.
Quantitative variable A variable in which the numbers act as numerical values is called quantitative. Quantitative variables always have units.
Identifier variable A variable holding a unique name, ID number, or other identification for a case. Identifiers are particularly useful in matching data from two different databases or relations.
Created by: Musapdx