BIOS 603

Descriptive Statistics Problems

Learning Objective 1

Determine if a variable is binary, categorical without order, categorical with order or continuous.

Classify each of the following variables as binary, categorical without order, categorical with order or continuous. Some may be of more than one type depending upon how they were measured.

      1.  Age
      2.  Ethnic origin
      3.  Source of drinking water
      4.  Level of education
      5.  Height
      6.  Exposure to lead
      7.  Level of cholesterol
      8.  Political orientation
      9.  Political affiliation
     10.  Income
     11.  Occupation
     12.  Attitude toward statistics

Answer

Learning Objective 2

Compute and interpret the three common measures of central tendency: the mean, median and mode.

1. Find the mean, median and mode of these numbers:
1,4,3,8,11,8,2,12,5,6



2. Find the mean, median and mode for this data.

        Score     Frequency
          1           4
          2           5
          3           7
          4           5
          5           4   

3. Find the mean, median and mode for this data.

     Score     Frequencey
       1            3
       2            6
       3            7
       4            3
       5            2
       6            2
       7            1
       8            1

Answer

Learning Objective 3

Compute and interpret the three common measures of variability: the range, variance and standard deviation.

Compute the range, variance and standard deviation for the problems listed for objective two.

Answer

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