STATISTICAL TECHNIQUES AND TOOLS
CONFIDENCE INTERVALS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Given the same mean, SD, and sample size, a confidence interval of 80% would be wider than a confidence interval of 90%
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True
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False
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Either A or B
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None of the above
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Explanation:
Detailed explanation-1: -A 99 percent confidence interval would be wider than a 95 percent confidence interval (for example, plus or minus 4.5 percent instead of 3.5 percent). A 90 percent confidence interval would be narrower (plus or minus 2.5 percent, for example).
Detailed explanation-2: -The confidence interval of an estimated value is the probability range, based on the estimated value, that contains the true value. That is, if an estimated value is 50 and the confidence interval of 80% is ±5%, then there is an 80% probability that the true value is between 45 and 55.
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