seeing the football game or the commercials. The results are summarized in the table. Male Female Total Game 279 200 479 81 156 237 Commercials Won’t 132 160 292 Watch Total 492 516 1008 Question: What’s the marginal distribution of the responses? Conditional Distributions The more interesting questions are contingent. We’d like to know, for example, what percentage of second-class passengers survived and how that compares with the survival rate for third-class passengers. It’s also more interesting to ask whether the chance of surviving the Titanic sinking depended on ticket class. To do that, we look at the row percentages: Second Third Crew Alive 203 118 178 212 711 28.6% 16.6% 25.0% 29.8% 100% Dead 122 167 528 673 1490 8.2% 11.2% 35.4% 45.2% 100% By focusing on each row separately, we see the distribution of class under the condition of surviving or not. The sum of the percentages of each row is 100%, and we divide that up by ticket class.
seeing the football game or the commercials. The results are summarized in the table. Male Female Total Game 279 200 479 Commercials 81 156 237 Won’t Watch 132 160 292 Total 492 516 1008 Question: What’s the marginal distribution of the responses? Conditional Distributions The more interesting questions are contingent. We’d like to know, for example, what percentage of second-class passengers survived and how that compares with the survival rate for third-class passengers. It’s also more interesting to ask whether the chance of surviving the Titanic sinking depended on ticket class. To do that, we look at the row percentages: Second Third Crew Alive 203 28.6% 118 16.6% 178 25.0% 212 29.8% 711 100% Dead 122 8.2% 167 11.2% 528 35.4% 673 45.2% 1490 100% By focusing on each row separately, we see the distribution of class under the condition of surviving or not. The sum of the percentages of each row is 100%, and we divide that up by ticket class.
Chapter%203%20Student%20Notes.docx