The USGA (United States Golf Association) regularly tests golf equipment to ensure that it conforms to USGA standards. Suppose it wishes to compare the mean distance traveled by four different brands of golf balls when struck by a driver (the club used to maximize distance). The following experiment is conducted: 10 balls of each brand are randomly selected. Each is struck by “Iron Byron” (the USGA’s golf robot named for the famous golfer Byron Nelson) using a driver, and the distance traveled is recorded. A layout of the experimental design is portrayed in Figure 9.2 Identify each of the following elements in this experiment: response, factors, factor types, levels, treatments, and experimental units.

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Brand A Figure 9.2 Brand B Brand C 1 Brand D 1 Distances for 10 randomly selected balls from Brand B lot