Frequency Distribution and measures of central tendancy

Qualitative

non numerical, descriptive, discrete

Quantitative

numerical, discrete or continuous, quantity

Nominal

categories (eye color)

Ordinal

Order (level of satisfaction)

Interval

Equal units (temperature)

Ratio

Math (height)

Frequency Distribution

An organized tabulation of the number of individuals located in each category on the scale of measurement

Histogram

represents continuous data well, touching bars

Positively skewed

Tail goes right

Negatively Skewed

Tail goes left

Normal curve

symmetrical, unimodal distribution

Central tendancy

the descriptive statistic that best represents the center of a data set

Mean - influence of scores

change in one score will always change M, very sensitive to outliers

Median

good for data with outliers

Mode

most frequently occuring