Casio fx-CP400 User Manual page 137

 When
is an odd number, using the median of the total population as the reference, the population
elements are divided into two groups: values less than the median and values greater than the median.
The median value is excluded. Q
Q = {median of the group of ( − 1)/2 items from the bottom of the population}
1
Q = {median of the group of ( − 1)/2 items from the top of the population}
3
 When
= 1, Q = Q
1
[Q , Q on Data] checked: The Q
1 3
Q = {value of element whose cumulative frequency ratio is greater than 1/4 and nearest to 1/4}
1
Q = {value of element whose cumulative frequency ratio is greater than 3/4 and nearest to 3/4}
3
The following shows an actual example of the above. (Number of Elements: 10)
Data Value
1
2
3
4
5
6
7
 3 is the value whose cumulative frequency
ratio is greater than 1/4 and nearest to 1/4,
so Q = 3.
1
 5 is the value whose cumulative frequency
ratio is greater than 3/4 and nearest to 3/4,
so Q = 5.
3
u To display paired-variable calculation results
1. On the Stat Editor window or Stat Graph window, tap [Calc] - [Two-Variable].
2. On the dialog box that appears, specify the [XList] and [YList] names, select the [Freq] setting, and then tap
[OK].
• This displays the dialog box with the paired-variable statistical calculation results described below.
o, p :
sample mean
Σ , Σ : sum of data
Σ , Σ
2 2
: sum of squares
σ , σ :
population standard
deviation
s , s : sample standard deviation
and Q then become the values described below.
1 3
= population center point.
3
and Q values for this calculation method are described below.
1 3
Frequency Cumulative Frequency
1
1
2
3
1
1
1
:
Σ
minX, minY : minimum
maxX, maxY : maximum
1
2
4
7
8
9
10
Reference Point (0.25)
0.1 0.2
1 2 3
Q
1
sample size
: sum of products of
XList and YList data
Cumulative Frequency Ratio
1/10 = 0.1
2/10 = 0.2
4/10 = 0.4
7/10 = 0.7
8/10 = 0.8
9/10 = 0.9
10/10 = 1.0
Reference Point (0.75)
0.4 0.7
3 4 4 4
Chapter 7: Statistics Application
0.8 0.9 1.0
5 6 7
Q
3
137