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Random Samples and Biased Samples

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For a survey, a company manager assigned a number to each of the company’s 500 employees, and put the numbers in a bag. The manager chose 20 numbers and surveyed the employees with those numbers. Did the manager choose a random sample ?

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Paula wants to know the favorite type of music for students in her class. She puts the names of all students in a hat, draws 8 names, and surveys those students. The population is students in Paula’s class. This sample is random or biased ?

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Sara wants to know the favorite type of music for students in her class. She selected 5 her close friends as a sample and asked their favorite type of music. The population is students in Sara’s class. This sample is random or biased ?

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At a birthday party, teams for a game are chosen by putting everyone's name into a jar, and then choosing the names for each team. Is the sample randomly selected?

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To choose a sample of size 20 to determine the preferred practice day of all the players in a soccer league, the coach placed the names of all players in a hat and he draw 20 names. The population is 20 players from all players existed. This sample is random or biased ?

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Mr. David is the principal of a school and he wants to check how many students are good in math in 7th grade. He takes the attendance of 7th grade and selects 5 students for a math quiz. The population is students in 7th grade. This sample is random or biased ?

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Adam tossed a fistful of silver coins into the air, then picked up the two coins. Is this a random sample of the coins?

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Adam polled ten passengers in the first-class section of the plane. The population is passengers in the first-class section of the plane. This sample is random or biased ?

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Roberto wants to know the favorite sport of adults in his hometown. He surveys 50 adults at a baseball game. The population is adults in Roberto’s hometown. This sample is random or biased ?

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Sansa surveyed her five favorite footballers in the league about their training techniques. The population is Sansa’s favorite footballers. This sample is random or biased ?