Re: Hypothesis testing

Posted by Kamal1 on Jun 04, 2009; 2:48am
URL: http://discussion-forum.276.s1.nabble.com/Hypothesis-testing-tp2996383p3022439.html

A tire manufacturer has been making snowtires. His test tyres has averaged 52,500 miles with a std deviation of 7,075. A new tread design is thought to add additional wear to the tires. Sixty tires with new process are tested revealing a mean of 54,112 miles, with a standard deviation of 7,912 miles. At the 5% level can it be said that the new tread adds to the wear.

Allen Webster chptr 8 question 68