Statistic Assignment siska mutiara, Kirana ayu imani, zahra nabilah, niluh putu citra dewi IX D

1. STATISTICS
MATH ASSIGNMENT
IX D
• Kirana Ayu Imani
• Siska Mutiara
• Niluh Putu Citra Dewi
• Zahra Nabilah

2. What Is Statistics ?
• Statistics is the science or scientific method of collecting, organizing,
processing, presenting and analyzing data and drawing conclusion
according to the result of the data analysis.
• Statistics is the study of statistics from a mathematical standpoint,
using probability theory as well as other branches of mathematics
such as linear algebra and analysis. The term "mathematical
statistics" is closely related to the term "statistical theory" but also
embraces modelling for actuarial science and non-statistical
probability theory.
• Statistics is the science of collecting, organizing and summarizing
data such that valid conclusions can be made from them. The
collecting, organizing and summarizing part is called “descriptive
statistics”, while making valid conclusions is inferential statistics.

3. Collection of Data
• Collection of the data is the beginning stage (the
first step) in the statistical activity. Collecting data
can be performed by interview of questionnaire,then
continued by one of the following activities :
1. Counting
2. Measuring
3. Recording data by tallies

4. Two Types Of Statistica Data
• QUANTITATIVE data are obtained from the
result of numerical recording(in the form of
figures)
• QUALITATIVE data are data related to the
category of characteristics of an object.

5. Measure Of Central Tendency
• MEAN (arithmetic mean)
Mean of data set is the sum of all data values divided
by the number of data
• MODE
Mode is the value that occurs most frequently
• MEDIAN
Median is measure of central tendency used to
analyzed data.

6. Formula
• MEAN
mean( x ) = sum all value ( ∑n )
number of data (n)
• MODE
Mode = the value of highest frequency
• MEDIAN
Median = middle value after being ordered
• RANGE
Range = the highest score – the lowest score

7. For Example
4,3,7,6,5,4,8,7,6.
Mean = 1+3+4+4+5+6+7+7+8
9
=5
Median = 1,3,4,4,5,6,7,7,8
=5
Mode = 4 and 7
Range = 8 – 1
=7

8. We had tried to survey about
“ How Much Your Daily Pocket Money ?”
And
“ How Long Your Time To Study ?”
In grade VII A , Total students is 30.
And the result is …

9. “ How Much Your Daily Pocket
Money ?”
A. Rp 5,000,- = 1 person
B. Rp 10,000,- = 11 person
C. Rp 15,000,- = 18 person
Lets try to measure the central
tendency !

10. Data Tally(ies) Frequency X.F
5,000 I 1 5,000
10,000 IIII IIII I 11 110,000
15,000 IIII IIII IIII III 18 270,000
Total : 30 385,000
Mean = 385,000
30
= Rp 12,833,-
Median = 15,000
Mode = 15,000
Range = 15,000 – 5,000
= 10,000

11. The Result In Pie Chart

12. “ How Long Your Time To Study ?”
A. 1 hour = 4 person
B. 2 hours = 15 person
C. 3 hours = 11 person
Lets try to measure the central
tendency !

13. Data Tallies Frequency X.F
1 hour IIII 4 4
2 hours IIII IIII IIII 15 30
3 hours IIII IIII I 11 33
Total : 30 67
Mean = 67
30
= 2,23 hours / 133,8 minutes
Median = 2 hours
Mode = 2 hours
Range = 3 – 1
= 2 hours

14. The Result In Pie Chart

15. T h a n k
y
y o u