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Formula for positive skew
mode<median<mean
Formula for no skew
mode=median=mean
Formula for negative skew
mode>median>mean
How is the mean affected by linear coding?
Adding: old mean + x
Multiplying: old mean * x
How is the standard deviation affected by linear coding?
Adding: sd is unchanged
Multiplying: old sd * x
What is the addition rule?
Tests for ME events
P (A or B) = P(A) + P(B) - P(A and B)
What is the test for independence?
P(A and B) = P(A) * P(B)
What is the formula for conditional probability?
P(A given B) = P(A and B)/P(B)
What is the formula for V(X) in a rectangular distribution?
1/12 * (b-a)²
Note
Flashcard