25. In order to obtain a small margin of error with high levels of confidence, C, you will need observations. A) a large number of B) a small number of C) 10 D) None of the above.

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An agricultural researcher plants 25 plots with a new variety of yellow corn. Assume that the yield per acre for the new variety of yellow corn follows a Normal distribution with an unknown mean of u and a standard deviation of o= 10 bushels per acre. 24. Which of the following would produce a confidence interval with a smaller margin of error than the 90% confidence interval? A) Plant only five plots rather than 25, because five are easier to manage and control. B) Plant 10 plots rather than 25, because a smaller sample size will result in a smaller margin of error. C) Plant 100 plots rather than 25, because a larger sample size will result in a smaller margin of error. Compute a 99% confidence interval rather than a 90% confidence interval, because a higher confidence level will result in a smaller margin of error.

(c) Is your approximation for 7 too large or too small? Explain. Use this information together with the error bound you found in part (b) to construct the smallest interval you can guarantee contains the true value of 7.

The heights of young American women, in inches, are Normally distributed a with mean of u and a standard deviation of o=2.4. 31. The margin of error for a 99% confidence interval is desired to be t1 inch. What should be the sample size? A) 7 B) 22 C) 38 D) 39

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25. In order to obtain a small margin of error with high levels of confidence, C, you will need observations. A) a large number of B) a small number of C) 10 D) None of the above.

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