SOLUTION: A principal wants to know if the students at her school like the food served in the cafeteria, so she asks the first 25 students in the line at lunch. Identify the type of sample

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Question 1180805: A principal wants to know if the students at her school like the food served in the cafeteria, so she asks the
first 25 students in the line at lunch. Identify the type of sample and describe the population. Then tell if the
sample is biased. Explain.
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
It is biased because not everybody in the population has a defined non-zero probability of being chosen. If some students can't possibly be in the first 25, their probability is not some non-zero value (even if very small). It is zero. Better to choose every third (second, fourth, whatever) student.
This is a convenience sample. The population is all the students in the school. The sample is biased. The explanation is above.