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April 25th, 2012, 09:12 AM   #1
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hypothesis testing

A researcher would like to determine if relaxation training will affect the number of headaches for chronic headache sufferers. For a week prior to training, each subject records the number of headaches suffered. Subjects then receive relaxation training and for the week following training the number of headaches is again measured. The change in number of headaches before and after training is as follows (minus signs indicate a reduction):
Difference scores: -5 -1 -4 -3 -6 -8 0 +1 -1
Is there an effect of training?

showing the work would be very helpful, I just do not understand this
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April 27th, 2012, 03:05 AM   #2
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Re: hypothesis testing

Can you tell us if there's a part of this you do understand? This looks like a matched sample to me, where they've already given you the difference between the two for each subject. From there it would be like working a regular hypothesis test, where the null is that mu = 0 (i.e. no difference). If you don't know how to do that, then you need to backtrack and do some reviewing, because this would be built upon some prior concepts.

Can you start it by finding the mean and standard deviation of the sample differences? Then the standard error? Something? Because otherwise you've got a lot missing and you're going to continue to not understand it if you don't go back and catch some of this stuff, and I'd also hate to take a lot of time explaining how to get a sample standard deviation and such things if you already know that part.
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April 27th, 2012, 02:53 PM   #3
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Re: hypothesis testing

Quote:
Originally Posted by Erimess
Can you tell us if there's a part of this you do understand?.
Sorry - I just now looked at this post again and that first sentence sounds a bit harsh. I wasn't meaning it like that. It was just meant to be a question, and I was trying to stress the idea of telling us what part you actually do understand. Now I did mean it that you need to know the background for doing this, but I wasn't intending to be "harsh" about it.
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