Five Brands of Orange Juice Are Displayed Side by Side

Essay

Five brands of orange juice are displayed side by side in several supermarkets in Vancouver. It was noted that in 1 day, 180 customers purchased orange juice. Of these, 30 picked Brand A, 40 picked Brand B, 25 picked Brand C, 35 picked Brand D, and 50 picked Brand E. Can you conclude at the 5% significance level that there is a preferred brand of orange juice in Vancouver? Justify your answer.