Basic Applied Statistics 200
Solutions to Practice Quiz 1

1.  
   1. Explanatory variable is categorical: walking at least 90 or less than 40 minute a week. Response variable is categorical: mental impairment or not. Summarize with proportions.
   2. (ii)
   3. Prospective: give them a journal to record how much time they walk each day. Retrospective: ask them to recall how much time they walked each day.
   4. (ii)
   5. They could have fewer physical ailments and feel better in general.
   6. (i)
   7. (i)
   8. (iii)
2.  
   1. Explanatory variable is categorical: walking at least 90 or less than 40 minute a week. Response variable is quantitative: cognitive test score. Results are those quantitative values, summarized with means.
   2. (i)
   3. (ii)
   4. (ii)
   5. poor health
   6. (v)
   7. Conclude those who walk a lot do have better mental function, when in fact they don't.

[ Home | Calendar | Assignments | Handouts ]