solprac1

# solprac1 - Practice Examination # 2 Sta 113: Probability...

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Name: Sta 113 Problem 1 : Circle the best answer for each of parts 1–9: 1. A agricultural researcher plants 25 plots with a new variety of corn. A 90% conFdence interval for the average yield for these plots is found to be 162 . 72 ± 4 . 47 bushels per acre. Which of the following would pro- duce a conFdence interval with a smaller margin of error (i.e. shorter width) than this 90% conFdence interval? a) Plant only 5 plots rather than 25, because it is easier to control variability in 5 plots than in 25. b) Plant 100 plots rather than 25. c) Compute a 99% conFdence interval rather than a 90% conFdence interval. The increase in conFdence indicates that we have a better interval. d) None of the above.
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## This note was uploaded on 01/17/2010 for the course STA 113 taught by Professor Staff during the Fall '08 term at Duke.

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solprac1 - Practice Examination # 2 Sta 113: Probability...

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