Suppose the USGA is interested in comparing the mean distances the four brands of golf balls travel when struck by a five-iron and by a driver. Ten balls of each brand are randomly selected, five to be struck by the driver and five by the five-iron.

Identify the elements of the experiment and construct a schematic diagram similar to Figure 9.1 to provide an overview of this experiment.

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Figure 9.1 Designed experiment: Process and terminology Treatment 1 sample Responses for treatment 1 Apply factor-level combination 1 Treatment 2 sample Population of experimental units Responses for treatment 2 Designed experiment Sample of experimental units Apply factor-level combination 2 Apply factor-level combination k Treatment k sample Responses for treatment k