Statistics 1770 Lecture Notes - Caffeine, Miscarriage, Contingency Table

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12 Sep 2013
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What: variables- sex, grades, day since cigarette, days since last drink, how often they wear seatbelts. Stat-crunch: use to look at data- you can enter your own, or use textbook data, you can look at frequency or percentage of totals, grouping allows different results for certain sets. Results: looks like males and females behave differently with respect to seatbelt use, with males generally less inclined or less likely to wear them. 64% of females always wear a seatbelt, compared to 50% of males; whole 19% of males never or rarely wear a seatbelt, versus. Conditional distributions: tells us the distribution of one variable over various categories. The seatbelt usage (variable) over the categories of sex. Is there an assoc. between caffeine consumption and miscarriages in pregnant women: two categorical sets. Miscarriage (yes or no: contingency table. Rows: describe values of one categorical variable (caffeine) Columns: describe values of another categorical variable (miscarriage)

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