Mathematics
Mathematics, 06.05.2020 03:19, kennieharris726

The mean yield of corn in the United States is about 135 bushels per acre. A survey of 40 farmers this year gives a sample mean yield of 138.8 bushels per acre. We want to know whether this is good evidence that the national mean this year is not 135 bushels per acre. Assume that the standard deviation of the population is 10 bushels per acre.

Report the value of the test statistic z :

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The mean yield of corn in the United States is about 135 bushels per acre. A survey of 40 farmers th...

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