Central tendency

Central tendency

1. These measures are focus on the average or middle values of a data.

2. Describes the center position of a distribution for a statistic sample.

3. Mean

   • Is a simple average. To calculate the mean you must add up the numbers and divide by the quantity of values.
     • Example
       • For the values 3, 4, 5, 3, 2, 7, 8, 9, 3, 3, 6, the mean is calculated as 3+4+5+3+2+7+8+9+3+3+6/11. The mean is 4.81818

4. Median

   • Is the middle number of an organice data set, this point represents the 50% of the observed data.
     • Example
       • In the list of values {3, 4, 5, 3, 2, 7, 8, 9, 3, 3, 6} the sorted order becomes {2, 3, 3, 3, 3, 4, 5, 6, 7, 8, 9}. The median is 5 since there is five numbers on either side.

5. Mode

   • Is the most frequently value in data set. Can be one mode, more than one or no mode.
     • Example
       • In the list of values below: 3, 4, 5, 3, 2, 7, 8, 9, 3, 3, 6. The mode is 3 since it appears more times than any other number.