Monday
March 30, 2015

Homework Help: Statistics

Posted by Kristi on Monday, October 31, 2011 at 1:54pm.

Please help!! I have no idea how to do this question.

14. A sample of 40 CDís from your collection showed a mean length of 52.74 minutes with a standard deviation of 13.21 minutes
a. Construct the 95 percent confidence interval for the mean.
b. Construct the 95 percent confidence interval for the mean using the t-value rather than the z-value. Comment on why the interval is larger when you use the t-value.
c. Why might normality of the data set be in question here? Comment on your answer.

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

statistics - A sample of 40 CDs from a student's collection showed a mean length...
Statistics - From her firmís computer telephone log, an executive found that ...
statistics - Use the given information to find the minimum sample size required ...
statistics - Times for a surgical procedure are normally distributed. There are ...
business statistics - For one of the tasks in a manufacturing process, the mean ...
statistics - A cell phone service provider has selected a random sample of 20 of...
RES/342 - From her firmís computer telephone log, an executive found that the ...
Statistics - a laptop manufacturer finds that the average time it takes an ...
statistics - A random sample of size 81 is taken from a large population, ...
statistics - 1. A random sample of size 49 is taken from a large population, ...

Members