# left tail, right tail, two tail

• Aug 12th 2007, 08:19 PM
mkcar
left tail, right tail, two tail
I'm having a hard time trying to fiqure out this problem.
the instructions say to determine whether the hypothesis test for each claim is left-tailed, right-tailed, two-tailed. then explain why

The mean life of a certain tire is no less than 50,000 miles.

What steps do I take, the book does a crappy job!
• Aug 12th 2007, 10:06 PM
CaptainBlack
Quote:

Originally Posted by mkcar
I'm having a hard time trying to fiqure out this problem.
the instructions say to determine whether the hypothesis test for each claim is left-tailed, right-tailed, two-tailed. then explain why

The mean life of a certain tire is no less than 50,000 miles.

What steps do I take, the book does a crappy job!

A two tailed test is one to test a hypothesis about \$\displaystyle x\$ of the form: \$\displaystyle x_{left}<x<x_{right}\$

A (left) one tailed test is one to test a hypothesis about \$\displaystyle x\$ of the form: \$\displaystyle x_{left}<x\$

A (right) one tailed test is one to test a hypothesis about \$\displaystyle x\$ of the form: \$\displaystyle x<x_{right}\$

RonL
• Aug 13th 2007, 03:03 PM
TKHunny
Quote:

Originally Posted by mkcar
What steps do I take, the book does a crappy job!