BUS 215 Lecture Notes - Lecture 1: European Route E18, Scientific Notation

• School: Stony Brook University
• Department: Business Management
• Course: BUS 215
• Professor: Aaron Young- Shin Kim

Document Summary

Rule a b x x x a b x. )a b x ab xy x y ln( ln ab b a a ln( ) b ln( ) a ln( ) b ln( ) 3 ln(2) ln(3) ln(8) ln(3) ln( ba b a ln( ) ln(2 ) 3ln(2) In statistics, we take sums all the time. The symbol means take the sum of. when we write n. It means to add n values of x: For example, if x1 = 3, x2 = 5, x3 = 4, and x4 = 2, the sum is. In statistics, we often take sums of squared values. The sum of squares is not the same as the square of the sum. In the previous example, the sum of squares is n. 54 while the square of the sum is. In statistics, we often need to take the sum of a product of two variables: n. 1 i x y i i x y.