Question

lawrence performs a survey to determine the average number of minutes of exercise seventh - grade athletes get in one week. he gets a list of sports and the seventh - grade students participating in each sport. he then chooses 10 people from each list to complete the survey. how can lawrences sample be improved to be more representative of the population? he can choose his sample from all seventh - grade students. he can choose his sample from a list of students by class rather than by sport. he can choose his sample from every third person on each list rather than 10 people. he can choose his sample from a list of all athletes participating in each sport.

Explanation:

Lawrence wants to find average exercise - time of seventh - grade athletes. His current sample is 10 people from each sport list. To be more representative of all seventh - grade athletes, he should sample from all athletes in each sport. Sampling from all seventh - grade students includes non - athletes. Sampling by class is not relevant to the population of athletes. Sampling every third person may not cover all types of athletes well.

Answer:

He can choose his sample from a list of all athletes participating in each sport.