Most new products are test marketed in several locations, frequently using different advertising techniques. The followi

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Most new products are test marketed in several locations,
frequently using different advertising techniques. The following
table represents the number of sales for a new product at each of
three locations during each of the last 4 months. Location I II III
456 441 501 421 419 467 397 415 520 419 420 493 Test whether there
is a difference among the mean sales at the three locations. Use α
= 0.05.