vemi007
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Two experimental drugs , drug X and Y are being evaluated for treatment of CHF. patients receiving drug X have a cardiac index of 2.5 L/m2 with a 95% confidence interval of 1.5-3.5. patients receiving drug Y have a cardiac index of 1.7L/m2 with 95% confidence level of 0.7-2.7. a test of the significance of the difference shows a p-value of 0.1.which of the following is the likely hood that the difference in mean cardiac index of patients receiving drug X and drug Y is due to chance
a) 0%
b) 2.5%
c) 5%
d) 7.5%
e) 10%
f) 66.7%
g) 99%
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| cyra
Moderator
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e.10%
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| robin082006
Forum Hero
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B
Alpha = 0.1 so we fail to reject the null hypothesis at the significance level alpha = 0.1. It means that 90% (1-0.1) of treatment results are similar and only 10% are different.
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| zzpearl
Forum Senior
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 confused, robin082006, what is ur answer? b .2.5% OR e 10%? Or it should be 90%(not in there) since Q asking for "difference in mean cardiac index of patients receiving drug X and drug Y is due to CHANCE"?
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| satyaking
Forum Junior
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well he is asking the difference by chance that is nothing but statistical probability of the test that is o.1, 1 in 10 people the difference is by chance hence the answer is 10%
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| msyamp
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its 99 % right robin?
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| drk1980
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can someone explain this?
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| msyamp
Forum Fanatic
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hey sorry guyz its 0%
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| msyamp
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i know the explanation. but
i will wait for any one who tried to foind it out and explain why?
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| laxmi
Forum Senior
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vemi 007, its a very gud ques. i dint get the ans. msyamp pls give the xpalanation!
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| msyamp
Forum Fanatic
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hey laksmi its a direct question from our material.
if you have confidence intervals of two test over lappng.
that means there is no significant difference between the results of the tests.
check in kaplan and you will find in page 629 stats
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| laxmi
Forum Senior
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thanx msyamp. i got it.
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| ezabelbef
Forum Newbie
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E. 10% is the answer
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| Cordoba
Forum Newbie
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Since P value > 0.05 "alpha" that means we don't reject the null hypothesis, then the differences between the two groups is attributed to chance alone. i.e 99% !!
so the answer is : G
P.S : please explain your answer, even if you pretend to be genius..etc.
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| docswapna
Forum Senior
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A or E or G????///
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| Allymd
Forum Senior
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Wow it is tough! hehe.. do you have the answer?? I wouldnt know exactly, but would be one of the highest one... F or G.
First, p value is not significant to reject the null hypothesis, but we are not given the statistical power to determine the risk for a B error. And also, the confidence interval for drug Y have 1.0 as a value, so it means it has no significance. I would go with G... what do you think guys?
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| klimt
Forum Guru
Topics: 27
Posts: 605
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I first went for E. Now I'm totally confused...
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