Stats Ch 2 exploring data w tables & graphs

Section 1 frequency distributions gor organizing & summarizing data

Frequency distribution

shows how data is grouped or spread out by organizing data into bins and displaying the frequency (or count) of data values in each bin

The size or width

Shows how data is grouped or spread out by organizing data into bins and displaying the frequency (or count) of data values in each bin

Too much detail (small bins)

Makes trends harder to spot, but too little detail (large bins) eliminates the relevant rends all together

Frequency distributions

Can be created for quantitative or qualitative data. The bins for a quantitative data set represent a range of values from one to another, while the bins in qualitative data set are categories

Cumulative relative frequency distribution

Gives the relative frequency of each bin and all data in the previous bins - quantitative data only (final bin frequency of 1 or 100%

Approximately normal distribution

Is “bell-shaped.” This is a quantitative distribution with lowest frequency and the highest bins and the highest frequency in the middle-most-bins.

Low data values

Very low frequency (<5% of data)

Mid-low data values

Low frequency (5-15% of data)

Middle data values

High frequency (60-80% of data)

Mid-high data values

Low frequency (5-15% of data)

High data values

very low frequency (<5% of data)