A film alliance used a random sample of 50 U.S. citizens to estimate that the typical American
Question:
A film alliance used a random sample of 50 U.S. citizens to estimate that the typical American spent 78 hours watching videos and DVDs last year. The standard deviation of this sample was 9 hours.
a. Develop a 95% confidence interval for the population mean number of hours spent watching videos and DVDs last year.
b. How large a sample should be used to be 90% confident the sample mean is within 1.0 hour of the population mean?
Fantastic news! We've Found the answer you've been seeking!
Step by Step Answer:
Related Book For
Statistical Techniques in Business and Economics
ISBN: 978-0078020520
16th edition
Authors: Douglas Lind, William Marchal
Question Posted: