Question

Scores on IQ test are normally distributed. A sample of 14 IQ scores had standard deviation s=6. Construct a 99% confidence interval for the population standard deviation. The developerof the test claims that the population standard deviation is =7. Does this confidence interval contradict this claim?

Answer #1

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Scores on an IQ test are normally distributed. A sample of 12 IQ
scores had standard deviation s=6 (a) Construct a 95% confidence
interval for the population standard deviation σ. Round the answers
to at least two decimal places. (b) The developer of the test
claims that the population standard deviation is σ=7 Does this
confidence interval contradict this claim? Explain.

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interval for the population standard deviation . Round the answers
to at least two decimal places. (b) The developer of the test
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IQ scores among the general population have a mean of
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σ
, of IQ scores for males is less than
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16
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10
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0.1
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standard deviation of 15. Assume that many samples of size n are
taken from a large population of people and the mean IQ score is
computed for each sample
a. If the sample size is n equals= 64, find the mean and
standard deviation of the distribution of sample
means.
The mean of the distribution of sample means is: 105
The standard deviation of the distribution of sample...

IQ
scores are normally distributed with a mean of 100 and a standard
deviation of 15. Determine the 90th percentile for IQ scores

Suppose you know that the IQ scores of all incoming college
freshman are normally distributed with standard deviation of 15.
You have a simple random sample of 100 freshmen, and the mean IQ
score for this sample is 120. Find a 90-percent confidence interval
for the mean IQ score for the entire population of incoming college
freshmen

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