FORESTRY
AGRICULTURAL STATISTICS AND ECONOMICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of the following would not decrease the width of a confidence interval?I. Increasing the sample sizeII. Decreasing the degrees of freedomIII. Decreasing the confidence level
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I only
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II only
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III only
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I and II only
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II and III only
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Explanation:
Detailed explanation-1: -Increasing the sample size decreases the width of confidence intervals, because it decreases the standard error.
Detailed explanation-2: -The population size does not alter the ‘width of a ‘confidence interval’ for a ‘population proportion.
Detailed explanation-3: -A larger sample size or lower variability will result in a tighter confidence interval with a smaller margin of error. A smaller sample size or a higher variability will result in a wider confidence interval with a larger margin of error.
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