Answered step by step
Verified Expert Solution
Link Copied!

Question

1 Approved Answer

CRA CDs Inc. wants the mean lengths of the cuts on a CD to be 125 seconds (2 minutes and 5 seconds). This will allow

CRA CDs Inc. wants the mean lengths of the "cuts" on a CD to be 125 seconds (2 minutes and 5 seconds). This will allow the disk jockeys to have plenty of time for commercials within each 10-minute segment. Assume the distribution of the length of the cuts follows a normal distribution with a standard deviation of eight seconds. Suppose that we select a sample of 13 cuts from various CDs sold by CRA CDs Inc. Use Appendix B.1 for the z-values.

a. What can we say about the shape of the distribution of the sample mean?

Sample mean (Click to select) Normal/Uniform/Binomial

b. What is the standard error of the mean? (Round the final answer to 2 decimal places.)

Standard error of the mean seconds.

c. What percentage of the sample means will be greater than 130 seconds? (Round the final answer to 2 decimal places.)

Sample means %

d. What percentage of the sample means will be greater than 121 seconds? (Round the final answer to 2 decimal places.)

Sample means %

e. What percentage of the sample means will be greater than 121 but less than 130 seconds? (Round the final answer to 2 decimal places.)

Sample means %

Please help me with this question.

Thanks!

Step by Step Solution

There are 3 Steps involved in it

Step: 1

blur-text-image

Get Instant Access to Expert-Tailored Solutions

See step-by-step solutions with expert insights and AI powered tools for academic success

Step: 2

blur-text-image

Step: 3

blur-text-image

Ace Your Homework with AI

Get the answers you need in no time with our AI-driven, step-by-step assistance

Get Started

Recommended Textbook for

Green Jobs For Sustainable Development

Authors: Ana Maria Boromisa, Sanja Tišma

1st Edition

131775185X, 9781317751854

More Books

Students also viewed these Economics questions