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Biology and Environmental Science

The historical mean yield of soybeans from farms in Indiana is 31.9 bushels per acre. Following a recent dry summer, a random sample of 26 farms across the state was obtained. The mean yield in bushels per acre was x = 30.088 with σ = 4.433.

Is there any evidence to suggest the lack of rain adversely affected the soybean yield in Indiana? Assume the underlying population is normal and use a = 0.01.

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