I Appreciate Any Help To Answer The Following Statistical Question?

Sep - 22 | By: AHT | 3 comments.

Filed under : Weight Loss

A researcher is conducting a study about the presentation of diabetes mellitus in White and Asian populations. He found that the percentages of patients presenting with weight loss were 20% and 25% in White and Asian population respectively.
Which is the most appropriate statistical study to determine if there is any significant statistical difference in the study?

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3 Responses to “I Appreciate Any Help To Answer The Following Statistical Question?”

modulo_f says:

September 23, 2009 at 1:18 am

Generally you’d need sample sizes. You clearly didn’t sample the entire white or asian populations!
I think that a 2 sample t-test is probably what you’d want to use. You’d have the
null hypothesis: that there’s no difference between the two groups,
and
the alternative hypothesis: that there is
You would either state a confidence level, say 95% or, calculate a p-value.
But you definitely need sample sizes.
cvandy2 says:

September 23, 2009 at 2:28 am

Forget t-tests!
The appropriate test is a two-proportion Z-test, where:
Z = [(X1/n1) -(X2/n2)]/?[phat(1-phat)(1/n1+1/n2)]
Where phat = (X1 + X2)/(n1 + n2)
X1 = number whites with diabetes (in this sample).
X2 = number of Asians with diabetes (in this sample).
Compare your calculated Z-value with the Critical Z-value found in the standard normal table with ?/2.
You could also do a chi-square test for independence (aka, contingency table), but that’s too complicated to explain (at this time).
walsh_pa says:

September 23, 2009 at 4:24 am

two sample t-testhttp://ccnmtl.columbia.edu/projects/qmss…