Overview
     Central Tendency
       Mean
       Weighted Mean
       Median
       Mode
      What Is Central Tendency?
  3
       Score that best 
         captures the 
         entire group of 
         scores
       Mean
       Median
       Mode
      Mean
  4
       Arithmetic average
       Add scores & divide by # of scores
                                                           X
       More Terms                                X 
          Population mean m (“mu”)                          n
          Sample mean M or X
          Population N
          Sample n
          When writing in APA style N total sample, n for 
           portion of sample
      Mean: an exercise
  5
                  Here is a data set: 2  3  3  5  6  7  9 
                                                   X
         What is the mean?                X 
                                                      n
       Answer
   6
                     Here is a data set: 2  3  3  5  6  7  9 
                                                             X
          What is the mean?                       X 
                                                                n
                    2 + 3 + 3 + 5 + 6 + 7 + 9        35
                    -------------------------------    =    ------      =  5
                         7               7