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% con dence 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 con dence interval that contains = 110?

## Answer This Question

## Related Questions

- Math (Statistics) - The SAT scores of a certain population of students are ...
- statistics college - SATI SCORES AROUND THE NATION HAVE A MEAN SCORE AROUND 500 ...
- statistics - A specific study found that the average number of doctor visits per...
- statistics - 1. Suppose you administered an anxiety test to a large sample of ...
- Math - The IQ scores are normally distributed with a mean of 100 and a SD of 15...
- statistics - A large group of students has taken a college entrance exam. The ...
- statistics - 4. Suppose you administered an anxiety test to a large sample of ...
- statistics - A specific study found that the average number of doctor visits per...
- statistics - Suppose that the test scores for a college entrance exam are ...
- statistics - sat scores around the nation tend to have a mean score of about 500...

More Related Questions