Definition Of Statistics•Statistics is the science that studies how to

plan, collect, analyze, interpret, and present data. In short, statistics is a science with respect to data.

• Statistika adalah ilmu yang mempelajari bagaimana merencanakan, mengumpulkan,

menganalisis, menginterpretasi, dan mempresentasikan data. Singkatnya,

statistika adalah ilmu yang berkenaan dengan data.

•Data = information obtained from the result of observation or research

•Data collection can be performed through interviews / quetionnaries followed by counting, measuring or by recording the data using the tallies

•The measures of central tendency consist of mean, mode and median

Mean, Mode and Median.......•Mean : the average value of a group

•Mode : the value which appears most eften or the value of hingest frequency

•Median : the middle value after the data are ordered

data can be presented in two forms, namely a table/list and a graph/diagram

Table/ListNumber of..... Frequency

Graph/Diagram

Categ

ory

1

Categ

ory

2

Categ

ory

3

Categ

ory

40123456

Series 1Series 2Series 3

Categ

ory

1

Categ

ory

30123456

Series 1Series 2Series 3

Sales

1st Qtr2nd Qtr3rd Qtr4th Qtr

•A line diagram is used to show the development of a continous condition

•In a pie diagram, the size of the central angle of each sector is proportional to the size of tyhe data each category

MANFAAT STATISTIKA• Manfaat statistika dalam kehidupan sehari-hari sangat beragam

sebagai contoh sederhana:

• • Bagi ibu-ibu rumah tangga mungkin tanpa disadari mereka telah menerapkan statiska. Dalam membelanjakan uang untuk kebutuhan keluarganya sering melakukan perhitungan untung rugi, berapa jumlah uang yang harus dikeluarkan setiap bulannya untuk uang belanja, listrik, dll.

• • Sebagai mahasiswa, selain statistika dipelajari secara formal sebenarnya kita sudah menggunakannya dalam perhitungan Indeks prestasi.

• • Dalam dunia bisnis, para pemain saham atau pengusaha sering menerapkan statistika untuk memperoleh keuntungan. Seperti peluang untuk menanamkan saham.

• • Sedangkan dalam bidang industri, statistika sering digunakan untuk menentukan keputusan. Contohnya berapa jumlah produk yang harus diproduksi dalam sehari berdasarkan data historis perusahaan, apakah perlu melakukan pengembangan produk atau menambah varian produk, perlu tidaknya memperluas cabang produksi, dll.

Jadi, statistika sebenarnya sangat penting bagi kita, dapat berguna dalam menentukan keputusan meskipun kadangkala penggunaannya tidak kita sadari.

Result of our Survey

•After we survey to 7A class, we ask them with some question and after that, we

collecting the data. and this is the result

Lets us discuss the topic

•From 29 (absen 3) student in the 7A class, we find the answer and we make a frequency table like this :

Vehicles Frequency

Mobil Jemputan 5

Motor Pribadi 6

Motor (Diantar Orangtua)

10

Mobil (Diantar Orangtua)

2

Becak 3

Sepeda 0

Kendaraan Umum

0

Jalan Kaki 0

vehicles used to go to school (use pie diagram)

Mobil jemputan Motor pribadiMotor (Diantar orangtua)

Mobil (Diantar Orantua)

Becak Sepedakendaraan Umum Jalan kaki

to find mean, mode and median. We need some formula :

•Mean = sum of all values : number of the data

•Modus : by looking the frequency

•Median : by looking the middle of the data after we ordered

Lets find the answer !

•Mean = 26 : 8 = 3,25 = 3

•The Modus is = Motor (Diantar Orangtua) about 10 students

•The Median is = (13 & 14) Mobil Pribadi (Diantar Orangtua)

not only asking about vehicles used to go to school, but we ask other question too

extracurricular activities they are interested

okay, this is the table frequency about their interested on extracurricular

Type of extracurricular

badminton ICT

Football Basket English Scout Lainnya

Frequency 8 3 4 4 2 3 2

And this is the diagram

10

1

2

3

4

5

6

7

8

9

Chart TitleSeries1

Series2

Series3

Series4

Series5

Series6

Series7

Series8

So the mode, mean and median is.......•Mean = 26 : 7 = 3,7 = 4

•Mode = badminton (about 8 student interesting with it )

•Median = (13 & 14) Football / Basket

Their

ele

men

tary

sc

hool

Elementary School From Frequency

SDN Margadadi III 5

Margadadi VII 2

Margadadi I 2

Karanganyar I (Kelas jauh) 5

Lainnya 12

Mean, Mode and Median.....

•Mean = 26 : 5 = 5,2

•Mode = Lainnya (about 13 students)

•Median = (13 & 14) Karanganyar I (Kelas jauh) / SDN Margadadi III

And the last, about their interested lesson

Lesson’s Name Frequency

Mathematic 7

History 2

English Language 8

Japanese Language 6

Lainnya 3

Mean, Mode and Median

•Mean = 26 : 5 = 5,2

•Mode = English Language (about 8 students )

•Median = (13 & 14) mathematic

•from the observation that the results are different from each other and not much the same. but even so we should stick to the establishment of Indonesian nation that says "Different but one also“ yang artinya “berbeda-beda tapi satu jua”

•Terimakasih dan wassalam!!!!

Thanks For Your Attention, we hope you will agree

with our presentation, the last we say

Wassalamu’alaikum Wr Wb