1. The problem asks us to determine if the statement "Some quantitative data sets do not have medians" is true or false. 2. Recall that the median of a quantitative data set is the middle value when the data are arranged in order. 3. Important rule: Every quantitative data set has a median because even if the number of data points is even, the median is the average of the two middle numbers. 4. Therefore, it is impossible for a quantitative data set to not have a median. 5. The statement is false. 6. The correct true statement is: "All quantitative data sets have medians." 7. This corresponds to answer choice D.