Random
Description: Everyone in the population has an equal chance of being selected. It usually consistes of pulling names out of a hat or a random generator.
Advantages: No bias in selection, your results should be more representative, doesnt take very long unless sample is massive- thus more cost efficent.
Disadvantages: The larger the population the more difficult it becomes. You cannot be certain that your sample will representative all groups i.e. you may randomly pick 10 people with brown hair, 5 people with blond hair and no black haired people. In some experiments this mayt cause your results to not give a fair representation of the population.
Example: A univeristy undertook a study of how long students spend working each week. They gave out the survey to a group of 50 students, randomly selected from acroos the university by using a random computer generator.
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