Not having memorized the formula for variance in binomial distributions, but intuiting that said principle was true, was my weaker reason for concluding B.
More saliently, the problem statement contains the gratuitous information that boys are a majority in program A. It’s Kahneman and Tversky, for FSM’s sake; therefore this information is used to mislead. Therefore, B.
Not having memorized the formula for variance in binomial distributions, but intuiting that said principle was true, was my weaker reason for concluding B.
More saliently, the problem statement contains the gratuitous information that boys are a majority in program A. It’s Kahneman and Tversky, for FSM’s sake; therefore this information is used to mislead. Therefore, B.