Farm Sizes. The average farm size in the United States is 444 acres. A random sample of 40 farms in Oregon indicated a mean size of 430 acres, and the population standard deviation is 52 acres. At a 0.05, can it be concluded that the average farm in Oregon differs from the national mean? Use the P value method. The average farm in Oregon does not differ from the national mean. p=0.0886

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