A researcher at a marketing firm examines whether the age of a consumer matters when buying athletic clothing. Her initial feeling is that Brand A attracts a younger customer, whereas the more established companies (Brands B and C) draw an older clientele. For 600 recent purchases of athletic clothing, she collects data on a customer's age (Age equals 1 if the customer is under 35, 0 otherwise) and the brand name of the athletic clothing (A, B, or C). A portion of the data is shown in the accompanying table.

Purchase	Age	Brand
1	1	A
2	1	C
600	0	B

Excel Data File- Please see below

a-1. Construct a contingency table that cross-classifies the data by Age and Brand. Provide the frequencies in the accompanying table.