ECON2209 Lecture 4: 30January_EconStats_Karagodsky
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C n x = n! x! (n x!) Probability = all combinations that t the description ex: there are 6 type a t-shirts and 5 type b t-shirts in a crowd. There is a total of 11 people in the crowd. If you choose 3 people what is the probability of 2 a"s and 1 b. all possible combinations. 3 venn diagram (marginal and joint probabil- ity) There is a group of people (1000) some will be female, some male, some went to a concert and some didn"t. The numbers in the total row and column are called the marginal prob- abilities (who is male, who is female, who went out, who didn"t). The rest are join probabilities (who is female and went out, who is male and went out, who is female and stayed in, who is male and stayed in). *area outside of f is f", males p(f) = 51. 9.
