MHP
Forum Senior
Topics: 15
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9. Serum LDL-cholesterol concentrations are measured in blood samples collected from 100 healthy volunteers. The data follow a normal distribution. The mean and standard deviation for this group is 130 mg/dL and 20 mg/dL, respectively. The standard error of the mean is 5.0. The 95% confidence interval about the mean is 120 to 140 mg/dL. If blood samples are collected from 25 healthy volunteers instead of 100, which of the following best expresses the expected impact on the standard error and the 95% confidence interval about the mean?
Standard error Width of 95% confidence interval
A) ↓ ↓
B) ↓ ↑
C) ↓ no change
D) ↑ ↓
E) ↑ ↑
F) ↑ no change
G) No change ↓
H) No change ↑
I) No change no change
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| MHP
Forum Senior
Topics: 15
Posts: 110
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Please I need help with this Q
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| study_ing
Forum Fanatic
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E. u can either use a mathematical formula or intuition
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| study_ing
Forum Fanatic
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standard error= standard deviation/ square root of std deviation
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| abarbaryan
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MPH where is this question from?
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| robin082006
Forum Hero
Topics: 471
Posts: 5,125
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this is NBME
answer is E
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