A random sample is also called an unbiased sample.
A company surveys every tenth person in the phone book. What type of sampling did the company use?
Fifty students were randomly selected to take part in a survey about their favorite school lunch. Each student was allowed to only pick one item. The results are shown below.
Food Item Preferred- Number of Students
salad bar- 9
Based on the information above, if the school served 500 lunches, how many pizzas can they expect to serve?
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a randomized sample can be biased, but generally we randomize our sample from a population so we can avoid bias.