Question: Researchers asked a sample of 50 1 ^st grade teachers and a sample of 50 12 ^th grade teachers how much of their own money they spent on school supplies in the previous school year. They wanted to see if teachers at one grade level spend more than teachers at the other grade level.

1. What type of study is found—observational or randomized experiment? Explain.
2. What is the experimental unit?
3. What is the response variable?
4. What is the explanatory variable?
5. Do we have to worry about confounding variables in this instance? Why? If so identify a possible confounding variable?
6. Are either of the terms retrospective study or prospective study relevant? Explain.

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