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 USMLE Step 1 Forum USMLE Step 1 Discussion Forum: Let's talk about anything related to USMLE Step 1 exam

#1
05-16-2014
 USMLE Forums Scout Steps History: Not yet Posts: 25 Threads: 10 Thanked 8 Times in 8 Posts Reputation: 18
biostas

A study is conducted to assess the
relationship between serum protein YY
(PYY) concentrations and obesity. A total
of 24 subjects with BMIs ranging from 17
to 40 kg/m2 are enrolled in the study. A
fasting serum PYY concentration is
determined for each patient. The
investigators report that the correlation
coefficient between the two parameters is
–0.84 (p<0.001). Based on these results,
which of the following is the most
accurate conclusion?
(A) A decreased serum PYY
concentration is a cause of
obesity
(B) The likelihood of a correlation
between high BMIs and
serum PYY concentrations is
0.16
(C) Obesity is not related to serum
PYY concentrations
(D) The slope of the line showing the
relationship between serum
PYY concentrations and
BMIs is –0.84
(E) Subjects with lower BMIs have
higher serum PYY
concentrations

The anwser is E. I don't know why D is wrong?

#2
05-16-2014
 USMLE Forums Scout Steps History: Not yet Posts: 25 Threads: 10 Thanked 8 Times in 8 Posts Reputation: 18

Problem cleared. Thanks~

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