Homework Help: statistics

Posted by looking for someone to varify my work please on Tuesday, April 6, 2010 at 4:24pm.

Question:
A standard placement test has a mean of 105 and a standard deviation of ó = 13. Determine the minimum sample size if we want to be 99% certain that we are within 3 points of the true mean.

Answer:
N = ( zc ó/E)^2
= (2.575 x 13/3)^2
= 121

No one has answered this question yet.

Answer this Question

Related Questions

statistics - IQ scores are normally distributed with a mean of 105 and a ...
statistics - what are the mean and standard deviation of a sampling distribution...
statistics - Given a sample size of 38, with sample mean 660.3 and sample ...
Statistics - This is the first question..... For a population that has a ...
Statistics - data from sample of 400 cases, variable has 95% confidence interval...
statistics - A standard IQ test has a mean of 98 and a standard deviation of 16...
Statistics: Sample Size, Variance and Standard Dev - Sample Size, Variance and ...
statistics - You want to determine if your widgets from machine 1 are the same ...
Stats - A simple random sample will be obtained from a normally distributed ...
statistics - A test has a mean of 104 and a standard deviation of 16. We want ...

For Further Reading

First Name:
School Subject:
Answer: