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Homework # 2 Name ________________________________

Chapters 3 & 4
  1. The following data represent the number of hours a sample of 20 adolescents reported watching TV last week.

11 15 15 16 16 17 19 19 20 20 21 21 21 22 23 23 23 23 24 24

    1. calculate the mode of this set of scores (½ pt)
    2. calculate the median of this set of scores (½ pt):
    3. calculate the mean of this set of scores (1 pt):

      4.  

    4. calculate the sums of squares for this set of scores (2pts):

      5.  

       

       

       

       

    5. calculate the variance for this set of scores (1 pt):

      6.  

       

       

    6. calculate the standard deviation for this set of scores (½ pt):

 

 

 

  1. Identify each of the following symbols in terms of a) the index it represents and b) whether it represents a population or sample value (1 ½ pts):
    1. σ
    2. μ
      3.
    3. σ2
    4. s
    5. s2
  1. Given a set of normally distributed scores with a mean of 9.0 and a standard deviation of 4, what proportion of scores are: (5 pts)

 

    1. equal to or greater than 17

      2.  

       

       

       

       

    2. equal to or less than 7

      3.  

       

       

       

       

       

    3. between 9 and 21

      4.  

       

       

       

       

       

       

    4. between 5 and 21

      5.  

       

       

       

       

       

       

    5. equal to or less than 13