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Suppose you want to estimate the average GPA of all students at your school. You set up a table in the library asking volunteers to

Suppose you want to estimate the average GPA of all students at your school. You set up a table in the library asking volunteers to tell you their GPA. What kind of sample bias is this study likely to suffer from?

a. Nonresponse bias

b. Voluntary response bias

c. Incomplete sampling frame

d. There is no bias. Explain:

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