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Old 07-17-2011
dr.dhruvdesai's Avatar
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Stats biostat confidence interval question?

95 % confidence interval of two cardiac drugs x and y is as follows:
X= 2.2 - 3.5 and cardiac index 2.7 L/ m cube
Y= .6 - 1.6 and cardiac index 1.3 L/m cube

A test of significance is done to get a p value of .1

What's the likelihood that the the difference between cardiac index of X and Y is just by chance ?

a-0%
b-95%
c-97.5%
d-66.5%
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Old 07-17-2011
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pls explain the answer my friends
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Old 07-17-2011
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is this NBME?
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Old 07-17-2011
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nope.....but i think i saw one similar one one of those and so i wanna crack similar ones ...hoof...biostat a headache
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Old 07-17-2011
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Quote:
Originally Posted by dr.dhruvdesai View Post
nope.....but i think i saw one similar one one of those and so i wanna crack similar ones ...hoof...biostat a headache
So can you please tell us what is your source of the questions. I am not opening your threads because am thinking they are NBME, but if you tell us the source we'll be relieved
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Old 07-18-2011
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Quote:
Originally Posted by dr.dhruvdesai View Post
95 % confidence interval of two cardiac drugs x and y is as follows:
X= 2.2 - 3.5 and cardiac index 2.7 L/ m cube
Y= .6 - 1.6 and cardiac index 1.3 L/m cube

A test of significance is done to get a p value of .1

What's the likelihood that the the difference between cardiac index of X and Y is just by chance ?

a-0%
b-95%
c-97.5%
d-66.5%
its B....coz p value is 0.1,,,,,null hypothesis cant be rejected...in reality there is no difference..but given data suggest that 95% probability that both group have difference...so all 95% confidence is by chance....very low power study and high bete error...here beta error is 95%..
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