STATISTICAL TECHNIQUES AND TOOLS
CONFIDENCE INTERVALS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Find the critical value tc necessary to form a 95% confidence interval with a sample size of 15.
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1.960
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2.145
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2.131
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2.120
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Explanation:
Detailed explanation-1: -Conclusion: The critical value for a 95% confidence interval based on a sample size of 20 is t/2=2.093.
Detailed explanation-2: -Since the sample size is 24 and thus below 30, we will use Student’s t distribution to find the critical value. Thus the critical value is ±2.069 .
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