Week 3.1: Evidence about diagnosis - Part 2

Question 1

What are the odds of rolling snake eyes with a pair of dice?

Answer 1

6 x 6 x 6 = 216

Question 2

Sensitivity and specificity…:
A. are never affected by the size of the sample
B. can be described using 95% confidence intervals
C. can have 95% CI that are unequal sizes
D. all of the above
E. b and c are correct

Answer 2

E

Question 3

What does the dotted line represent?

Answer 3

Classification due to chance

Question 4

What is the Youden index?

Answer 4

Maximum vertical distance between the dotted line (classification) and the curve

Question 5

Area under the curve

Answer 5

1 = perfect test
0.5 = test does not discriminate the groups