CPM Homework Help : CCA2 Problem 11-64

A copy machine company advertises that its copiers will make at least $25{,}000$ copies before requiring maintenance. A consumer research group tested the claim by collecting data from users of the particular copy machine in $30$ different regions of the country. The means for each of the $30$ regions are listed in the table below.

$24928$

$24574$

$24652$

$24758$

$24691$

$24893$

$25024$

$24767$

$24791$

$24609$

$25249$

$24914$

24895

$24656$

$24883$

$24551$

$24928$

$25025$

$24798$

$25041$

$24782$

$25020$

$24618$

$24904$

$24764$

$24705$

$24889$

$24656$

$24600$

$24735$

checksum $744300$

Find the upper and lower $5\%$ bounds of the sample-to-sample variability and predict the number of copies that can be made before a machine requires maintenance. Do you think the consumer research group will support the company’s claim?

Hint:

Read the Math Notes box in Lesson 11.2.2.