This document discusses descriptive statistics and measures of central tendency, specifically the mean. It defines descriptive statistics and distinguishes it from inferential statistics. It then defines the mean as a measure of central tendency that summarizes data by finding the average value. The document provides examples of calculating the arithmetic mean from raw data sets and group data. It also discusses calculating the weighted arithmetic mean and addresses how to calculate the mean when dealing with large data sets or certain types of ratios.

1. ABDUL GHAFOOR SAJJAD 1

3. ABDUL GHAFOOR SAJJAD 3

4. *

5. LECTURE NO 01
Descriptive Statistics
Measures of Central tendency
(Mean, Median , Mode)

6. Dr Abdul Ghafoor Sajjad
HOD/Associate Professor
Department of Rehabilitation
Sciences
STMU

7. *Latin word
*Political state
*Numerical Facts
systematically arrange
*

8. *Procedures & Techniques
*Used to Collect, process
and analyze numerical
data
*To make inferences
*To reach decision
*

9. *
Statistics
Descriptive Inferential

10. *
Descriptive –
Statistics
Deal with concepts & methods
with summarization &
description of the important
facts of numerical data

11. *Visual presentation of the
data is not enough
*When we compare two
different data set
*Summarized in a single value
*Somewhere present in the
center
*

12. *Central tendency
*Measure of location and
position
*Generally known as Average
*

13. *
Averages
Arithmetic
means
Geometric
mean
Harmonic
mean
Median Mode

14. *

15. *

16. ARITHMETIC MEAN

17. ARITHMETIC MEAN

18. ARITHMETIC MEAN

19. ARITHMETIC MEAN

20. ARITHMETIC MEAN

21. ARITHMETIC MEAN

22. ARITHMETIC MEAN

23. ARITHMETIC MEAN

24. ARITHMETIC MEAN

25. ARITHMETIC MEAN

26. ARITHMETIC MEAN

27. S.
No
Weig
ht
(Kg)
Height(C
M)
Height
(m)
Height
(m2)
BMI Mean
BMI
1
2
3
4
5
6
7
8

28. *How we calculate the
mean from of multiple
groups mean

29. Semester No of
Students
Mean
Weight
Height (m)
1st 15 67kg
2nd 15 58kg
3rd 12 73kg
4th 08 82kg
?

30. Semester No of
Students
Mean
Weight
Height (m)
1st 15 67kg 1.72
2nd 15 58kg 1.62
3rd 12 73kg 1.57
4th 08 82kg 1.63

32. The Weighted Arithmetic Mean

33. The Weighted Arithmetic Mean

34. The Weighted Arithmetic Mean
Semester No of
Students
Mean
Weight Xw
1st 15 67kg
68.14
2nd 15 58kg
3rd 12 73kg
4th 08 82kg
280kg

35. *How we calculate mean
from group data

36. ?

42. *When “n” in large
how we calculate the
Mean?

49. *How we calculate the
Mean when we deal
certain kinds of ratios or
rate of change?

51. S. No Distance Speed
1 30km 15km/hr
2 30km 20km/hr
3 30km 25km/hr

52. *The harmonic mean is a type of
numerical average. It is calculated by
dividing the number of observations
by the reciprocal of each number in
the series. Thus, the harmonic mean
is the reciprocal of the arithmetic
mean of the reciprocals.