Data statistic

Problem

• We want to know about the students shoe size in IX D.

Identification Process

• We collect the data by observation (by asking one by one)

Collected Data

NO Name Size

1 Adit 40

2 Ahmad 42

3 Altafiyani 41

4 Annisa 40

5 Dina 37

6 Emilia 40

7 Ghaisani 37

8 Gina 39

9 Hani 37

10 Hilya 42

11 Ikhram 43

12 Ilmi 37

13 Jody 42

NO Name Size

14 Kezia 41

15 Lisana 37

16 Madiha 39

17 M. Farhan 42

18 Mutiara 40

19 Nurcholish 42

20 Nurhaliza 37

21 Nurmaulida 38

22 Nynsca 39

23 Sofie 40

24 Weby 37

25 Wini 40

PopulationThe population is all students in IX D

SampleNo sample, because the data is not too

numerous and we collect data by observe all students in IX D (as population)

Sorting Data

The data is still random, so we have to arrange the data:

37 = 7 students

38 = 1 student

39 = 3 students

40 = 6 students

41 = 2 students

42 = 5 students

43 = 1 student

Highest value = 43

Lowest value = 37

Mean

Shoe Size 37 38 39 40 41 42 43

Frequency 7 1 3 6 2 5 1

Mean =

=

=

=

= 39.56

Mode

Shoe Size 37 38 39 40 41 42 43

Frequency 7 1 3 6 2 5 1

The highest frequency = 7 (which are the shoe size is 37)

Mode = the data which have high frequency

= 37

Median

n = number of data = 25

The ... data =

=

= = 13th

The 13th data is 40.

So, median of the data is 40.

Shoe Size Frequency The ... data

37 71st,2nd,3rd,4th,

5th,6th,7th

38 1 8th

39 3 9th,10th,11th

40 6 12th,13th,14th,15th,16th,17th

41 2 18th,19th

42 5 20th,21st,22nd

,23rd,24th

43 1 25th

Range

After sorting the data, we know that:

Highest value = 43

Lowest value = 37

So, the range is = Highest value – Lowest value

= 43 – 37

= 6

Quartiles

Quartile 2 (Q2) = median of the data (the 13th data)

= 40

Quartile 1 (Q1) = the middle of the lowest value and Q2

The ... data =

= = 7th

So, Q1 is the 7th data = 37

Shoe Size 37 38 39 40 41 42 43

Frequency 7 1 3 6 2 5 1

The...data 1st,2nd,3rd,4th,5th,6th,

7th

8th 9th,10th

,11th

12th,13th,14th,15th,16th,17th

18th,19th 20th,21st,22nd,23rd,

24th

25th

Quartiles

Quartile 3 (Q3) = the middle of Q2 and the highest value

The ... data =

=

= 7 from 13 (Q2) = 19th

So, Q3 is the 19th data = 41.

Shoe Size 37 38 39 40 41 42 43

Frequency 7 1 3 6 2 5 1

The...data 1st,2nd,3rd,4th,5th,6th,

7th

8th 9th,10th

,11th

12th,13th,14th,15th,16th,17th

18th,19th 20th,21st,22nd,23rd,

24th

25th

Chart

Bar Chart

0

1

2

3

4

5

6

7

8

37 38 39 40 41 42 43

The

nu

mb

er

of

stu

de

nts

Shoe Size

Shoe Size in IXD

Line Chart

0

1

2

3

4

5

6

7

8

37 38 39 40 41 42 43

Student Shoe Size in IXD

Pie Chart

28%

4%

12%24%

8%

20%4%

Student Shoe Size in IXD

37

38

39

40

41

42

43

Pictogram Chart

• 37 :

• 38 :

• 39 :

• 40 :

• 41 :

• 42 :

• 43 :

Conclusion

In our opinion, the most appropriate diagram forour data which is the data of the students shoe size in9D is a bar chart. Because, in addition to a bar chart iseasy to read and made, it is also very suitable topresent data that include the amount. Compared withother diagrams created difficult and less fit to presentdata that include the amount.