Unit 2
Mean Average ∑x
x=
n
Mode Most frequently occurring M0
Median Middle value n+1
Position
2
1st quartile ¼ of data set n+1
Position
4
3rd quartile ¾ of data set 3 ( n+1 )
Position
4
Percentile Specific value Pn0
Mean:
Calculator Process:
Mode
STAT
1-VAR
Insert value and add = sign after
AC, SHIFT, 1
SUM
∑x
Press =
The answer obtained needs to be / by the number of values in data set
Interpretation: The average … of …… in the sample is …… unit (i.e., years) or younger.
Mode:
Identify the value in data set that occurs most often.
Interpretation: the most frequently occurring …. amongst the …. In the sample is ….. units.
Median:
NB! First work out position then from this, look for corresponding value
n+1
Median Position =
2
n= Number of values in set
*From this assign the corresponding value to the position
Interpretation: Half the …. In the sample are …. units or less
Mean Average ∑x
x=
n
Mode Most frequently occurring M0
Median Middle value n+1
Position
2
1st quartile ¼ of data set n+1
Position
4
3rd quartile ¾ of data set 3 ( n+1 )
Position
4
Percentile Specific value Pn0
Mean:
Calculator Process:
Mode
STAT
1-VAR
Insert value and add = sign after
AC, SHIFT, 1
SUM
∑x
Press =
The answer obtained needs to be / by the number of values in data set
Interpretation: The average … of …… in the sample is …… unit (i.e., years) or younger.
Mode:
Identify the value in data set that occurs most often.
Interpretation: the most frequently occurring …. amongst the …. In the sample is ….. units.
Median:
NB! First work out position then from this, look for corresponding value
n+1
Median Position =
2
n= Number of values in set
*From this assign the corresponding value to the position
Interpretation: Half the …. In the sample are …. units or less
