Checking if data follows a normal distribution
The normality test in basic statistics is a tool that is similar to the probability plot used in Chapter 2, Tables and Graphs. It is limited to testing normality but it does offer us the choice between Anderson-Darling statistics, Kolmogorov-Smirnov, and Ryan-Joiner tests.
Here, we will use the data from the Oxford weather station and check the normality of the mean maximum temperature for July.
Getting ready
The data for this example can be found on the Met Office website at http://www.metoffice.gov.uk/climate/uk/stationdata/oxforddata.txt.
The data is made available in the Oxford Weather.txtfile; this preserves the format from the website and also the Minitab Oxford weather (cleaned).mtwfile. This worksheet ...
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