Introducing Statistics: Learning from Data Practice Test

A city transportation department selects a simple random sample of 120 intersections from all intersections in the city and records whether each has a functioning pedestrian “walk” signal. In the sample, 102 intersections have a functioning signal. Which conclusion is supported by these data?

A researcher wants to study the relationship between weekly exercise time and resting heart rate among adults who belong to a particular gym. She records data from 60 gym members who volunteer to participate. The data show a negative association: members who report more weekly exercise tend to have lower resting heart rates. Which conclusion is supported by the data?