A supermarket manager believes that among the customers buying orange juice, 30% of the customers prefer Brand A, 20% prefer Brand B, and 50% prefer Brand C. Records from sales in a typical week showed the number of orange juice bottles sold is given in the following table.
At the level of significance 0.05, do these data support the Manager's belief?
Step by step method for testing the hypothesis under 5 step approach is discussed here. Excel template for each problem is also included. This template can be used to obtain the answers of similar problems.