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The average yield of grain on 9 randomly picked experimental plots of farm was found to be 150 bushels.The yield in bushels per plot in

The average yield of grain on 9 randomly picked experimental plots of farm was found to be 150 bushels.The yield in bushels per plot in previous studies was found to be approximately normally distributed with a population variance of 400 bushels.

A 98% confidence interval for the mean yield is:

Group of answer choices

136.9, 163.1

145.7, 154.4

132.8, 167.2

134.5, 165.5

144.8, 155.2

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