STATISTICAL TECHNIQUES AND TOOLS
CONFIDENCE INTERVALS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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increasing the confidence level, increasing the sample size
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increasing the confidence level, decreasing the sample size
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decreasing the confidence level, decreasing the sample size
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decreasing the confidence level, increasing the sample size.
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Detailed explanation-1: -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.
Detailed explanation-2: -The width of a confidence interval decreases as the sample size increases and increases as the confidence level increases. Explanation: Larger samples give narrower intervals.
Detailed explanation-3: -If the confidence level increases, the width of the confidence interval increases. If the confidence level decreases, the width of the confidence interval decreases.
Detailed explanation-4: -Increasing the confidence level increases the error bound, making the confidence interval wider. Decreasing the confidence level decreases the error bound, making the confidence interval narrower.