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5 Written questions

5 Multiple choice questions

  1. 75/100 * N
  2. for a data set is the difference between the third quartile and the
    fi rst quartile: Q3 Q1.
  3. is one of the contributing factors to sampling error. It is the result of choosing a bad sample. Good methods of sample selection minimize sample bias.
  4. is a sampling method which uses random or probabilistic selection as part of its design.
  5. is a controlled placebo study in which neither the subjects nor the scientists conducting the study know which subjects are in the treatment group and which are in the control group.

5 True/False questions

  1. outlieris an extreme data point that does not t into the overall pattern of the rest of the data.


  2. meanMax-min


  3. confounding variableis a possible contributing cause in a clinical study or trial that
    could produce the same effect as the variable under investigation. A good clinical study or trial attempts to eliminate confounding variables using a control group.


  4. Q175/100 * N


  5. rangeof a quantitative data set is a summary of the center of the data set.
    It is computed by adding the data elements together and dividing by N, the number of
    data elements.