1. Design by : Ms Sheema Aftab
Statistics
Design by :
Ms Sheema Aftab

2. Descriptive Statistics: Tabular and Graphical Presentations

3. Qualitative Data Frequency Distribution Tally sheet Bar Graph
Pie Chart

4. Example: Marada Inn Guests staying at Marada Inn were
asked to rate the quality of their
accommodations as being excellent,
above average, average, below average, or
poor.The ratings provided by a sample of 20 guests are:
Below Average
Above Average
Average
Average
Above Average
Below Average
Poor
Excellent
Above Average
Below Average
Poor
Average

5. Frequency Distribution
Poor
Below Average
Average
Above Average
Excellent
Rating 2 3 5 9 1
Total
Frequency

6. Bar Graph Marada Inn Quality Ratings 1 2 3 4 5 6 7 8 9 10 Frequency
Poor
Below
Average
Average
Above
Average
Excellent

7. Pie Chart Marada Inn Quality Ratings Excellent 5% Poor 10% Average 15%
Below
Average
15%
Above
Average
45%
Average
25%

8. Quantitative Data
Frequency Distribution
Histogram

9. Example: Hudson Auto Repair
The manager of Hudson Auto
would like to have a better
understanding of the cost
of parts used in the engine
tune-ups performed in the
shop. She examines 50
customer invoices for tune-ups. The costs of parts,
rounded to the nearest dollar, are listed on the next
slide.

10. Example: Hudson Auto Repair
Sample of Parts Cost for 50 Tune-ups

11. Frequency Distribution
Guidelines for Selecting Number of Classes
Use between 5 and 20 classes.
Data sets with a larger number of elements
usually require a larger number of classes.
Smaller data sets usually require fewer classes

12. Frequency Distribution
Guidelines for Selecting Width of Classes
Use classes of equal width.
Approximate Class Width =

13. Frequency Distribution
For Hudson Auto Repair, if we choose six classes:
Approximate Class Width = ( )/6 = 9.5   10
50-59
60-69
70-79
80-89
90-99
Parts Cost ($) 2 13 16 7 5
Total
Frequency

14. Histogram Tune-up Parts Cost Frequency Parts Cost ($) 18 16 14 12 10 8

15. Tabular and Graphical Procedures
Data
Qualitative Data
Quantitative Data
Tabular
Methods
Graphical
Methods
Tabular
Methods
Graphical
Methods
Bar Graph
Pie Chart
Frequency
Distribution
Rel. Freq. Dist.
Cumulative Freq.
Cumulative Rel. Freq.
Histogram
Scatter
Diagram
Frequency
Distribution
Rel. Freq. Dist.
Cum. Freq. Dist.
Cum. Rel. Freq.

16. Thank you