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An Agricultural Researcher Plants 25 Plots

with a new variety of corn. A 90% confidence interval for the average yield for these plots is found to be (158.25, 167.19) bushels per acre. Which of the following would produce a confidence interval with a smaller margin of error than this one? A. Using a 95% confidence level B. Reducing bias in the study design C. Planting 100 plots, rather than 25 D. Using 25 control plots with an old variety of corn E. None of the above
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C. Planting 100 plots, rather than 25 Margin of Error formula for x-bar is (critical value)(standard error) However, if we look at just the standard error = Sx/(Ã(n)), we can see that as n gets bigger, the standard error get smaller.

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