A teacher wants to see if there are any differences in the test scores of students who take her exam on the computer and those who take her exam the traditional paper and pencil way. Students with an odd digit at the end of their student ID number are required to take her midterm exam on the computer and those with an even digit are required to take a paper and pencil exam. Her study has a _____ sample with _____.
A) random / random assignment
B) convenience / random assignment
C) convenience / nonrandom assignment
D) random / nonrandom
Correct Answer:
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