Mike,
With randomization pre, it is not necessary to take a pre-intervention
measurement. Test the difference in confidence following the training. If
it is significant, there is a difference. Decide what direction it is in
and attribute the difference to the training. You can make this attribution
because of random assignment even without pre-measure.
-----Original Message-----
From: Mike Wogan [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, December 08, 1999 2:16 PM
To: Luv 2 muah 143
Cc: [EMAIL PROTECTED]
Subject: Re: could someone help me with this intro to stat. problem
On 8 Dec 1999, Luv 2 muah 143 wrote:
> 5 of 10 volunteers are randomly selected to receive self-defense training.
The
> other 5 receive no training. At the end of the training period, all
subjects
> complete a self-confidence questionnaire.
>
> a.) Is there a difference in self-confidence between the 2 groups
(p<.01)?
>
>
> b.) What are the effects of self-defense traing on self-confidence (I'm
> assuming a two-tailed test?). Explain analysis
>
> Please help, I can't figure it out...my mind has gone blank!!!!
Without a pre-test measure of self-confidence, taken prior to the
training, even if there is a significant difference post-training, it's
not possible to tell whether the difference is the result of the training
or was there to begin with.
If there is a pre-post measurement of self-confidence, then you need a
mixed model Anova, with Training vs. No Training as the between groups
factor and Pre-Post as the within groups factor.
Mike
