Bullet Points chapter 1

Frequencies can be displayed via histogram -> Numerical/quantitative data -> How many numbers per frequency?

Pie chart shows relative pieces of 100% distribution (its always 1/100%)

Vertical bar charts -> qualitative data with longer column names

Horizontal bar chart -> quantitative data frequencies etc.

Frequency density describes the concentration of data

e.g. if you have a tea cup of milk and fill it into a pint glass, the height of the milk will change

Same procedure happens with data, as the categories spread out more, the density spreads out

Density = frequency / group width

Histograms

NO gaps between the bars

Used for quantitative data with frequencies only to show distributions

Bar width proportional to frequency

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