Colin threw a handful of identically shaped buttons into the air, then collected the 12 buttons that landed on the carpet. Is this a random sample of the buttons?

While designing a new dessert menu, the manager of a restaurant offered customers a coupon in exchange for completing a brief survey about their favorite desserts. 15 of the customers accepted the offer. Is this a random sample?

Judy surveyed the 219 employees at the company who worked in Marketing. Is this sample of the employees at the company in general likely to be representative?

Samuel surveyed the 33 healthiest patients in the hospital. Is this sample of the patients in the hospital likely to be representative?

The librarian interviewed the 477 patrons who spent the most time at the library last year. Is this a random sample of the library patrons?

Layla polled the last 87 athletes to finish a bike race. Is this sample of the athletes in the bike race likely to be biased?

Janice surveyed the 87 top-ranking students in the high school. Is this sample of the students in the school likely to be biased?

Without looking, Fred took 17 coins out of a jar of equal-valued coins. Is this a random sample of the coins in the jar?

Gavin met 17 students in each class at his school. Each class has an equal number of students. Is this sample of the students of the school likely to be biased?

Braden asked 5 of his friends what they thought about a new movie. Is this sample of the students in the school likely to be biased?

Kendrick surveyed the first 35 students in the lunch line. Is this a random sample of the students in the school?

Camille experimented with 2 exercises from each class offered at her gym. Each class has an equal number of exercises. Is this sample of the exercises at the gym likely to be representative?

Omar tasted 13 desserts from each bakery in his county. Each bakery has an equal number of desserts. Is this sample of the desserts from the county's bakeries likely to be biased?