Delgado Community College Math 203 Reference Packet Measures of Central Tendency n X x N X Probabilities: ) | ( ) ( ) & ( A B P A P B A P n k k k k 3 2 1 ! )! ( ! r r n n C r n )! ( ! r n n P r n Miscellaneous 1 2 1 1 k 4 range s x z s x x z n x Discrete Probability x x P ) ( 2 2 2 ) ( x x P Binomial x n x x n q p C X P ) ( x n x q p X X n n X P ! )! ( ! ) ( np npq 2 Normal Approx. to the Binomial ) 5 . 0 5 . 0 ( ) ( a X a P a X P ) 5 . 0 ( ) ( a X P a X P ) 5 . 0 ( ) ( a X P a X P ) 5 . 0 ( ) ( a X P a X P Confidence Intervals n z x n z x 2 2 n s t x n s t x 2 2 n q p z p p n q p z p ˆ ˆ ˆ ˆ ˆ ˆ 2 2 Test Statistics n x z n pq p p z ˆ n s x t Regression bx a y 2 2 2 2 ) ( ) ( ) ( y y n x x n y x xy n r 2 2 2 x x n xy x x y a 2 2 x x n y x xy n b ) ( ) & ( ) | ( A P B A P A B P 68%, 95%, 99.7% Measures of Dispersion R=highest– lowest N x 2 2 N N x ) ( 2 2 2 N n X X / ) ( 2 2 2 1 2 2 n x x s 1 ) ( 2 2 2 n x N x s 1 / ) ( 2 2 2 n n X X s 1 ) ( ) ( 2 2 2 n n X X n s 1 3 Q Q IQR IQR 5 . 1 ) ( ) ( ) & ( B P A P B A P ) & ( ) ( ) ( ) ( B A P B P A P B or A P ) ( 1 ) ( E P E P Please return this reference sheet to your instructor after the final.
