題組內容

I. Researchers conducted a large-sample study to determine if smoking causes cancer. For each sample, they recorded information including smoking status (ever-smoker, never-smoker), weight, and cancer status (yes, no).

2. (10%) Let \( X, W \), and \( Y \) be random variables representing smoking status, weight, and cancer status, respectively. Specify the three random variables by their sample spaces and distributions. Explain your notations and parameters.