STATS 13 Chapter Notes - Chapter 5.3: Alternative Hypothesis, Null Hypothesis, Random Assignment
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In this section, we will see how we can use theory-based approaches instead of simulation to predict the outcome of tests comparing two group proportions and to generate related confidence intervals. Of 565 births where both parents smoked more than a pack per day, 255 were boys (45. 1%) Of 3,602 births where both parents did not smoke, 1975 were boys (54. 8%) 0. 451 to 0. 548 seem like they are considerably different. Null hypothesis: the population of boys born to smoking parents is the same as the population proportion of boys born to nonsmoking parents. There is no association between smoking status of parents and sex of child. Alternative hypothesis: the population proportion of boys born to smoking parents is different from the population proportion of boys born to nonsmoking parents. There is an association between smoking status of parents and sex of child. This study is an observational one since it"s not randomized.
