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 sample size ____ the confidence interval.
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increases
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decreases
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does not affect
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there is not enough evidence to determine the answer
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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: -As the sample sizes increase, the variability of each sampling distribution decreases so that they become increasingly more leptokurtic. The range of the sampling distribution is smaller than the range of the original population.
Detailed explanation-3: -How does the decrease in confidence affect the sample size required? The lower the confidence level the smaller the sample size.
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