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To analyse the results in the easiest way possible, graphs were made from the data, and statistical tests were done. These were T-tests and ‘Analysis of Variance (ANOVA)’. They are two parametric statistical techniques which are used to test the hypothesis of the experiments. A t-test is a statistical analysis of two populations means. ANOVA is to test larger groups and to find out if there is a difference between them.

The results of the red absorption-, green absorption-, and blue absorption groups with five test series of eight measurements each were analysed with ANOVA. The result in each colour group is not significant at p

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