# Thread: left tail, right tail, two tail

1. ## 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!

2. 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 $x$ of the form: $x_{left}

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

A (right) one tailed test is one to test a hypothesis about $x$ of the form: $x

RonL

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

1) Why are you qualified to judge the effectiveness of the book - speaking generally. Perhaps it works well for a large proportion of the population. You're just in the other portion. It's possible.

2) Why do you think there are "steps'? Perhaps this is where you think the book has a problem. It isn't showing you steps that simply don't exist. The "steps" are to review the material, resort to all applicable definitions and known structures, and then think about it. Would it have been useful if your book had said that?

3) It always helps me to know, whatever the subject matter, that someone thought of it before there was a book on it. I expect me to come up with stuff, perhaps in the same way as the original author. Learning how to think, construct, synthesize, and rationally move forward will help your life far more than memorizing a couple of steps.

My views. I welcome others'.

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# how to know what type of tailed test you have for statistics

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