A Study Determines That the Mean Blood Cholesterol Level Is

A study determines that the mean blood cholesterol level is 195 mg/dL in 200 non-diabetic hospitalized patients and 210 mg/dL in 180 diabetic hospitalized patients.  The probability that the observed difference is due to chance alone is reported to be 5%.  There is also a 20% probability of concluding that there is no difference in blood cholesterol level when there is one in reality.  What is the power of the study?

A) 0.05
B) 0.20
C) 0.50
D) 0.80
E) 0.95

Correct Answer:

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