AP Stat please help

Hi Lexi,
Thank you for signing up and welcome to Web2.0calc forum.
Unfortunately I can not help you with your question. Others may be able to but they are not around at the present time.

I would suggest that it may be expedient for you to place your question in one of the following forums.

http://mathhelpboards.com/potw/
My username here is Melody
Could you put me or 'I like Serena' (another member here) down as your referal please.

OR
http://mathhelpforum.com/
My username is Melody2 I don't think that they have a referal system.

These are similar forums (to each other). There are a lot of friendly people there. Someone should be able to help you.
Kind regards,
Melody.

lexiie96:

the painful wrist condition called carpal turned syndrome can be treatedwith surgery or less invasive wrist splints. in september 2002 time magazine reported a study of 176 patients. among half that had surgery, 80% showed improvement after three months, but only 54% of those who used the wrist splints improved. a) what's the standard error of the differences in the two proprtions? b) construct a 95% confidence interval for this diffence. c) state an appriopricat conclusion.

Hey lexiie96!


You can find the formulas for instance on:
https://en.wikipedia.org/wiki/Statistical_hypothesis_testing


In particular, the mean proportion p is:

p = (x1 + x2) / (n1 + n2)

where x1 is the number of people improved after surgery, x2 is the number of people improved with wrist splints, n1 is the number of people in the surgery group, and n2 is the number of people in the wrist splint group.


The standard error SE is:

SE = sqrt(p (1 - p) (1/n1 + 1/n2))


Perhaps you can use those formulas to find your answers?


You can get more and quicker help for this and similar questions indeed for instance on MHB.
If you register with this link, you'll give me a brownie point:
http://mathhelpboards.com/forum.php?referrerid=178
I do not know which referrerid Melody has though.