Twenty randomly selected adults who describe themselves as "couch potatoes" were given a six-week course in physical fitness. Before starting the course, each adult took a two-mile hike on the same trail. The time requires to complete the hike was recorded for each adult. After finishing the course, they all took the same hike again, and their times were recorded again. The following table lists the time recorded (in minutes) before and after the course for each of the 20 adults.

5. Twenty randomly selected adults who describe themselves as \"couch potatoes\" were given a six-week course in physical tness. Before starting the course, each adult took a two-mile hike on the same trail. The time requires to complete the hike was recorded for each adult. After nishing the course, they all took the same hike again, and their times were recorded again. The following table Lists the time recorded (in minutes} before and after the course for each of the 20 adults. [10] Use an appropriate distribution free test to determine whether tness increased signicantly aer the course. Use a 5% signicance level