Final answer:
Sean's data on lap swim time is classified as quantitative continuous, as it involves precise measurements of time that can include fractional seconds.
Step-by-step explanation:
Type of Data: Lap Swim Time
Sean is collecting data on lap swim time. This type of data is quantitative continuous. Continuous data include measurements that can take on any value within a range, not just whole numbers, and can thus be fractions or decimals. The lap swim time can be measured to a high degree of precision and will likely include fractional seconds. This contrasts with quantitative discrete data, which can only take on specific values, often as a result of counting, and include whole numbers without fractions or decimals. An example of this would be the count of laps swum.
Therefore, the type of data that Sean is collecting, lap swim time, falls under the category of quantitative continuous data because it involves measuring time, likely down to fractions of a second, and can assume an infinite number of values within a given range.