It is believed that the amount of nitrogen fertilizer used per acre has a direct effect on
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a. Is there sufficient reason to conclude that the use of more fertilizer results in a higher yield? Use a = 0.05
b. Estimate, with a 98% confidence interval, the mean yield that could be expected if 50 lb of fertilizer was used per plot.
c. Estimate, with a 98% confidence interval, the mean yield that could be expected if 75 lb of fertilizer was used per plot.
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