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 t* value for a 99% confidence interval with a sample of 23 people.
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1.714
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1.711
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2.064
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None of these.
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Explanation:
Detailed explanation-1: -The t value for 95% confidence with df = 9 is t = 2.262.
Detailed explanation-2: -If the level of confidence is 99%, this means that we are 99% confident that the interval contains the population mean, µ. The corresponding z-scores are ± 2.575. The difference between the point estimate and the actual population parameter value is called the sampling error.
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