George and michelle each claimed to have the better recipe for chocolate chip cookies. they decided to conduct a study to determine whose cookies were really better. they each baked a batch of cookies using their own recipe. george asked a random sample of his friends to taste his cookies and to complete a questionnaire on their quality. michelle asked a random sample of her friends to complete the same questionnaire for her cookies. they then compared the results. which of the following statements about this study is false? (a) because george and michelle have a different population of friends, their sampling procedure makes it difficult to compare the recipes. (b) because george and michelle each used only their own respective recipes, their cooking ability is confounded with the recipe quality. (c) because george and michelle each used only the ovens in their houses, the recipe quality is confounded with the characteristics of the oven. (d) because george and michelle used the same questionnaire, their results will generalize to the combined population of their friends. (e) because george and michelle each baked one batch, there is no replication of the cookie recipes.