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    %% Quantile-Quantile Plot for Normal Distribution

%%
% Use a quantile-quantile plot to determine whether gas prices in
% Massachusetts follow a normal distribution.

%%
% Load the sample data.
load gas

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% The sample data in |price1| and |price2| represent gasoline prices at 20
% different gas stations in Massachusetts. The samples were collected
% during two different months.

%%
% Create a quantile-quantile plot to determine if the gas prices in
% |price1| follow a normal distribution.
figure
qqplot(price1)

%%
% The plot produces an approximately straight line, suggesting that the gas
% prices follow a normal distribution.