Epidemiology 2

Question 1

Sensitivity =

Answer 1

TP/(TP+FN)

Question 2

Specificity =

Answer 2

TN/(TN+FP)

Question 3

Positive Predictive Value =

Answer 3

TP/(TP+FP)

Question 4

Negative Predictive Value =

Answer 4

TN/(TN+FN)

Question 5

What is the differnce between odds and risk?

Answer 5

The odds measures # of people who are affected over # of people not affected. Whereas risk measures # of ppl affected over total population.

Question 6

If the 95% confidence interval for an odds or risk ratio does not include 1, does this tell you about the p-value?

Answer 6

p-value is less than 0.05

Question 7

What do you conclude if the 95% confidence interval for a mean difference between 2 variables includes 0?

Answer 7

Test is not statistically significant. Null hypothesis is not rejected. p-value is greater than 0.05.

Question 8

What does the p-value represent?

Answer 8

The probability that a difference is based on chance alone. (probability of making a type I error - seeing a difference where there was none).