IQR

Q 1(25%) Q 3(75%)

Expected Value for a Discrete Random Variable

E(X) = sum of x times P(X = x)

Expected Value for a Binomial Distribution

E(X) = np

Union Probability

P(A or B) = P(A) + P(B) - P(A and B)

Union Probability Using a Venn Diagram

P(A or B) = P(Only A) + P(A and B) + P(Only B)

Complement Probability

P(Ac) = 1 - P(A)

Conditional Probability

P(A given B) = P(A and B) / P(B)

General Multiplication Rule

P(A and B) = P(A given B) times P(B)

Sensitivity

Number of true positives / Number who have the condition

Specificity

Number of true negatives / Number who do not have the condition