*Random sample?* Yes — Maya used a random sample from the county's health records. - *Independence?* The county has 500,000 adults. Is $120 \leq 0.10 \times 500{,}000 = 50{,}000$? Yes, easily. - *Nearly normal or large $n$?* $n = 120 \geq 30$, so the CLT guarantees the sampling distribution of $\bar