STATISTICAL TECHNIQUES AND TOOLS
CONFIDENCE INTERVALS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Use the z table or your calculator to find the critical value (Z*) that corresponds to 92% confidence.
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1.41
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1.75
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1.81
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1.96
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Explanation:
Detailed explanation-1: -The closest value is 0.9599 with the corresponding z value of 1.75. Hence, 1.75 is a 92% confidence interval for a standard deviation.
Detailed explanation-2: -The critical value is computed as The value corresponds to the row labelled as-1.8 and column labelled as 0.01. Hence the critical value for 93% confidence level is-1.81. Often the critical value is positive, so the critical value is sometimes given as 1.81.
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