STATISTICAL TECHNIQUES AND TOOLS
CONFIDENCE INTERVALS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The standard IQ test has a mean of 97 and a standard deviation of 17. We want to be 95% certain that we arewithin 5 IQ points of the true mean. Determine the required sample size.
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45
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154
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72
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10
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Explanation:
Detailed explanation-1: -IQ test scores are normally distributed with a mean of 105 and a standard deviation of 13. An individual’s IQ score is found to be 126.
Detailed explanation-2: -Yes, This number of IQ test scores is a fairly small number. An IQ test is designed so that the mean is 100 and the standard deviation is 21 for the population of normal adults.
There is 1 question to complete.