Mathematics
Mathematics, 12.11.2019 03:31, mohayon2020

The owner of a catering company wants to select a random sample of clients to find out about their food preferences.

select yes or no to tell whether each method results in a random sample of the population.

yes no
the owner uses a database to print the names of all clients on slips of paper. the owner chooses 20 of the slips of paper without looking.
the owner sends a survey to every client who spent more than $500 with the catering company in the past year.
the owner sends a survey to all clients whose phone number ends in 5.
the owner sends a survey to the last 20 clients who used the catering company's services.

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