Chris is a student at Mathville High School. He is conducting a survey at his school to learn how many hours a week on average students at the school spend on their math homework. Identify which sampling technique is used in the following and whether it is biased or unbiased. Chris surveys every 15th student from a list of all students enrolled at the high school. 61. Identify the sampling technique used. 62. Is the sample biased or unbiased? Chris hands out a questionnaire to the student body and asks them to fill it out and return it to him. 63. Identify the sampling technique used. 64. Is the sample biased or unbiased?

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