A supermarket chain conducts a survey by recording the brand of tea purchased by customers in its stores. The chain offers four bands of tea: A, B, C, D. The brand preferences of a random sample of...

1. A supermarket chain conducts a survey by recording the brand of tea purchased by customers in its stores. The chain offers four bands of tea: A, B, C, D. The brand preferences of a random sample of buyers are shown in the table:

Do the data indicate a preference exists for any of the brands? Test, using ? = 0.10.