StatTutor Lesson - Measuring spread: the quartiles

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      Questions 1-2

      61

      Question 1.

      True or false: Quartiles split the ordered data into five equally sized data sets

      A.
      B.

      Incorrect. Quartiles split the ordered data into four approximately equally sized data sets.
      Correct. Quartiles split the ordered data into four approximately equally sized data sets.
      Incorrect. Try again.
      2

      Questions 3-5

      153

      Question 3.

      What is the first step in finding the quartiles?

      A.
      B.
      C.

      Incorrect. The middle observation is not the median unless the data have already been ordered.
      Correct. The middle observation is not the median unless the data have already been ordered.
      Incorrect. Try again.
      2

      Questions 6-7

      232

      Question 6.

      When finding Q1 and Q3, if n is even, what should you do with the median value?

      A.
      B.
      C.
      D.

      Incorrect. Since the median is not one of the data values, we don't need to do anything with it to get the portion of the data used to find Q1 to be the same size as the portion of data used to find Q3.
      Correct. Since the median is not one of the data values, we don't need to do anything with it to get the portion of the data used to find Q1 to be the same size as the portion of data used to find Q3.
      Incorrect. Try again.
      2