A clinical psychologist wants to know the effect of caffeine intake on depression among out-patents. To test if there is effect of caffeine intake on depression, three samples of patient are selected with n= 7 in each sample. The first sample received no caffeine, second received low caffeine and third received high caffeine.The dependant variable is the scores in Beck Depression Inventory (BDI).
a. use an ANOVA with p< 0.5 to determine weather there are any significant differences among the three treatments.
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