Math 183 -- Basics of Data

Study basics of data for 183

Quantitative Data

Has to do with numbers; can be discrete or continuous

Qualitative Data

Has to do with categories; can be ordered or nominal

Discrete Data

A type of quantitative data. Includes a finite set of values or an infinite but separated sequence of values

Continuous Data

A type of quantitative data. Is a smooth zone of possibilities (an interval)

Nominal Data

Unordered categories of classification

Ordinal Data

Categories of classification that can be ordered

Ways to measure CENTER of data

Mean or median

Ways to measure SPREAD of data

IQR (median non-inclusive) or standard deviation

Standard Deviation Formula

Typical values are within 2 SDs of the mean

Skewed Right

Median < mean; data is lumped to the left

Skewed Left

Median > mean; data is lumped to the right