Question: To find out the average Mathematic final exam mark last semester, the final exam marks of all Mathematic students from last semester were gathered. An

To find out the average Mathematic final exam mark last semester, the final exam marks of all Mathematic students from last semester were gathered. An average from this data was calculated. Assuming that no data was lost in the process, which of the following can cause this average to differ from the true average?

1) Random Error

2) Non response bias

3) Selection Bias

4) None of the above

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