Homework Help: statistics

Posted by rose on Wednesday, December 5, 2012 at 2:51am.

8. Suppose that the IQ score for a person selected from a certain group of people
is approximately N(; 100). Let X1;X2; : : : ;Xn be a random sample of such IQ
scores.
(a) How large should n be so that a 90% condence interval for with maximum
error " = 1 is [ x 􀀀 1:645(10)=
p
n ; x + 1:645(10)=
p
n ]?
(b) Verify your answer empirically. In particular, simulate 50 random samples
of size n from the normal distribution N(110; 100). Do approximately 90%
of these samples yield a condence interval that contains = 110?

No one has answered this question yet.

Answer this Question

Related Questions

Statistics - On standard IQ tests, the mean is 110 and the standard deviation is...
Statistics - On standard IQ tests, the mean is 120 and the standard deviation is...
Statistics - On standard IQ tests, the mean is 100 and the standard deviation is...
statistics - On standard IQ tests, the mean is 120 and the standard deviation is...
Statistics - Some IQ scores are standardized with a mean of 100 and a standard ...
Statistics: IQ Score (X) and Exam Score (Y) - Assuming that the regression ...
Standard Deviation - On standard IQ tests, the mean is 100 and the standard ...
Math_Statistics - Some IQ scores are standardized with a mean of 100 and a ...
statistics - Find the probability that a randomly selected person has an IQ ...
Statistics - The home states of a certain group of people are distributed as ...

For Further Reading

First Name:
School Subject:
Answer: