msyamp
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A new treatment for elevated cholestrol is piloted on a sample of 100 men, ages 45-49 wiht total serum cholestrol in the range of 260-299 mg/dl at entry. Following three months on the medication the mean cholestrol for the group was 250 mg/dl with a standard deviation of 20 mg/dl. what is the 95% confidence interval on the mean for this study?
1. 210 - 290 mg /dl
2. 230 - 270 mg/dl
3. 246 - 254 mg/ dl
4. 248 - 252
5. 249 - 251 mg/dl
Please explain your answer.
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| vanshita
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210-290
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| msyamp
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actually good try BUt the answer s not that. can you explain your answer? and can anyone else differ from this? explain
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| vamsi2004
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250 +- 2 (20/10) = 250 +- 2x2 = 246 to 254
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| robin082006
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C for sure
standard error = SD/square root of sample= 20/10=2
95% CI= mean+/- 2*SE=250+-4= 246-254
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| study_ing
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yup C...i think its been explained 
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| vamsi2004
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ya its a comparitively easy ques, I dont know why a GENIUS like msyamp has posted it. i think there is some twist. Wats the correct ans?
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| usmle_mogul
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very nice q - from what qbank/book is it - could you recommmend please?
thank you robbin for details.
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| jsknetsdude
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3. 246 - 254 mg/ dl
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