QTM 100 Lecture Notes - Lecture 8: Standard Deviation, Probability Distribution, Random Variable

• School: Emory University
• Department: Quantitative Theory & Methods
• Course: QTM 100
• Professor: Ho Kim

Document Summary

Disjoint event: they cannot happen at the same time. Answer: dependent-knowing that one event happens will give info about the probability that another event happens. Multiplication or conditional rule doesn"t hold so they are dependent. 1st, 2nd , 3rd incorrect=0. 75 multiplication rule: independent events: pr(all 3 incorrect) =pr(1st incorrect and. Pr(at least one question correct) = 1 pr(no questions correct) = 1 0. 42 = 0. 58. B. 15 clicker: which of the following is not a property of the normal distribution: all of the above are correct. We use binominal distribution for dichotomous categorical variables (it has one of two possible outcomes) Pre-lab quiz example consider a student completely unprepared for 3 multiple choice questions on a pre-lab quiz with four responses each, and assume getting one question correct is independent of getting another question correct. Q1 q2 q3 probability scenario 1: c c i 0. 25 0. 25 0. 75 = 0. 047.