Melissa surveys all of the managers at her company.
Melissa uses a computer to randomly choose 20 people from a database that includes every person at her company. She then surveys those 20 people.
Melissa surveys the first 20 people who walk in the door in the morning.
None of these are random
Your teacher writes everyone's name down on a piece of paper and draws 10 names from a hat to survey.
Your teacher chooses only students wearing a red or blue shirt to survey.
Neither of these would result in a representative sample
Both of these would result in a representative sample