[EX09-158] Twenty-four oat-producing counties in the United States were randomly identified for the purpose of testing the

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[EX09-158] Twenty-four oat-producing counties in the United States were randomly identified for the purpose of testing the claim, “the mean oat crop yield rate is less than 60 bushels peracre.” For each county identified, the yield rate, in bushels of oats per harvested acre, was obtained: 44.0 65.0 78.5 50.0 52.5 51.0 47.5 67.5 76.7 33.3 73.6 20.0 57.0 52.0 68.6 42.9 63.0 80.0 37.0 70.0 43.0 30.0 60.0 67.5 Source: http://www.usda.gov/nass/graphics/county01/data/ot01.csv

a. Are the test assumptions satisfied? Explain.

b. Complete the test using   0.05.

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