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lecture10

# lecture10 - Last day looked at a variety of plots For...

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Last day, looked at a variety of plots For categorical variables, most useful plots were bar charts and pie charts Looked at time plots for quantitative variables Key thing is to be able to quickly make a point using graphical techniques
Recall: – A distribution of a variable tells us what values it takes on and how often it takes these values.

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Similar to a bar chart, would like to display main features of an empirical distribution (or data set) Histogram Essentially a bar chart of values of data Usually grouped to reduce “jitteriness” of picture Groups are sometimes called “bins”
Uses rectangles to show number (or percentage) of values in intervals Y-axis usually displays counts or percentages X-Axis usually shows intervals Rectangles are all the same width

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In a study of productivity, a large number of authors were classified according to the number of articles they published during a particular period of time.

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Experiment was conducted to investigate the muzzle velocity of a anti-personnel weapon (King, 1992) Sample of size 16 was taken and the muzzle velocity (MPH) recorded
Find minimum and maximum values of the data Divide range of data into non-overlapping intervals of equal length

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