A doctor recruited 15 volunteers and put them on 3 different diets that were supposed to lower the subjects’ cholesterol levels. The effects of the diet plans in terms of lowered cholesterol level are recorded in the table. Do the data cause as to reject the null hypothesis that the three different diet plans have the same effect? Do a 5 % test.

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Diet plan A 20 14 21 15 17 B 12 15 21 16 18 C 13 13 23 19 14