Question

gary wanted to determine the average height of boys at the high school. his older brother is on the basketball team, so he asked him to measure his teammates. after interpreting the results, gary determined the average height of a high - school - aged boy to be 6 feet, 1 inch. would you consider these results to be valid? yes, because only high - school boys were surveyed. yes, because the results were obtained randomly by measuring the boys basketball team. no, because boys on the basketball team are likely to be taller than the average high school boy. no, because there are no girls surveyed.

Explanation:

Gary's sample was only the basketball - team members. Basketball players tend to be taller than the general high - school boy population, so the sample is biased and the results are not valid.

Answer:

C. No, because boys on the basketball team are likely to be taller than the average high school boy.