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5 Written questions

5 Multiple choice questions

  1. is a sampling method which uses random or probabilistic selection as part of its design.
  2. is an alternative to a census, in which data is collected from only some members of the population.
  3. is 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. for a data set is the difference between the third quartile and the
    fi rst quartile: Q3 Q1.
  5. N=n1*n2/k

5 True/False questions

  1. Q375/100 * N


  2. five-number summaryfor a data set consists of the minimum value in the data set
    Min, the fi rst quartile Q1, the median M = Q2, the third quartile Q3, and the maximum value Max.


  3. mean75/100 * N


  4. rangeMax-min


  5. quantitative variableis a variable which represents a measurable quantity,
    one which can be represented by a number.