Life span of different 5 batteries in 20 different flashlights was investigated. The batteries were placed in a random flashlight and the life time was measured. You were given four lists A B C D with data from the 5 batteries and the averages and standard deviations were also given. It was asked to hypothesize that the averages were equal. You had to discuss these results and advise the researcher about what he should do differently in the future. Bonferoni for two treatments A and D, aplha 0.03. confidence interval with alpha 0.05 for D.