SOLUTION: A market researcher wants to find a confidence interval estimate of the mean age of all TCC students. A study done earlier in the year found that the standard deviation of all TCC

Question 437886: A market researcher wants to find a confidence interval estimate of the mean age of all TCC students. A study done earlier in the year found that the standard deviation of all TCC student ages was 14.2 years. How large a random sample must the researcher take in order to be 95% confident that the margin of error is 3.2 years?

Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
A market researcher wants to find a confidence interval estimate of the mean age of all TCC students. A study done earlier in the year found that the standard deviation of all TCC student ages was 14.2 years. How large a random sample must the researcher take in order to be 95% confident that the margin of error is 3.2 years?
----
Since E = zs/sqrt(n)
n = [zs/E]^2
----
n = [1.96*14.2/3.2]^2 = 76 when rounded up
Cheers,
Stan H.
RELATED QUESTIONS
A market researcher wants to find a confidence interval estimate of the mean age of all... (answered by ewatrrr)

A statistician wants to estimate the mean age of all college students. A random sample of (answered by Boreal)

The distribution of study times for first year students follows a Normal distribution... (answered by ewatrrr)

A researcher wants to determine a 95% confidence interval for the mean number of hours... (answered by ewatrrr)

A researcher wants to study the mean amount of time (in minutes) that kindergartners... (answered by stanbon)

a researcher wants to know the mathematical performance of th grade 11 statistics... (answered by math_tutor2020)

A sample of 60 grade 9 students' ages was obtained to estimate the mean age of all grade... (answered by CPhill)

A researcher wishes to estimate that mean age of all runners who participate in the... (answered by lynnlo)