STAT 1000 Quiz: STAT 1000 Quiz1-368
Practice Quiz 1
Statistics 1000
Dr. Nancy Pfenning
1. (5 pts.) An article entitled Moderate walking helps the mind stay sharper reports that
elderly people who walked at least ninety minutes a week were less likely to suffer from
mental impairment than those who walked less than forty minutes per week.
(a) Report the two variables of interest, which is explanatory and which is response,
and whether each is quantitative or categorical. Will results be summarized with
means or proportions?
(b) The design described is (i) an experiment (ii) an observational study (iii) a survey.
(c) Describe a way to gather information about walking habits that is prospective,
and another way that is retrospective.
(d) The design described is (i) paired (ii) two-sample.
(e) Describe at least one additional way that elderly people who walk a lot could
differ from those who walk very little.
(f) The most worrisome flaw is (i) confounding variables (ii) lack of realism
(iii) the placebo effect (iv) people’s faulty memories (v) non-compliance.
(g) When the researchers designed a questionnaire to determine walking habits, were
they focusing on (i) data production, (ii) displaying and summarizing,
(iii) probability, or (iv) statistical inference?
(h) Apparently the researchers found that the difference in rates of mental impairment
was so large that it was unlikely to have occurred by chance. Does this focus on
(i) data production, (ii) displaying and summarizing, (iii) probability, or
(iv) statistical inference?
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