An advertising agency tries to show the effect of a successful advertising campaign. It talked to a food company that is producing a new product, spaghetti sauce. The arrangement is to market the product in three different ways: no frills, a low-budget campaign, and a big-budget campaign. The three spaghetti sauces have the same ingredients and are sold side by side in different packages. The sales in 10 supermarkets during the first month are recorded in the following table.

(a) Do a 5 percent test to determine whether the three approaches result in different sales. Assume the sales do not follow a normal distribution.

(b) Do a 5 percent test to determine whether the high-budget campaign is better than the low-budget campaign.

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No frills 301 326 337 362 383 321 362 357 334 310 Low budget 402 355 348 351 372 356 375 358 335 312 High budget 423 364 359 340 389 354 378 356 338 332