1. BA 275 Quantitative Business Methods
Agenda
Summarizing Quantitative Data
Descriptive Statistics
Box and Whisker Plot
Quiz #1
Announcement
Check your COB account for any latest update.
CyberStats Tech support:
1 – 888 – 281 – 2990
1 – 800 – 423 – 0563
TA: Shen. 8:00 – 9:50 am, Friday at 328 Bx.

2. Statistical Analysis

3. Types of Data Numerical (Quantitative) Data
Regular numerical observations. Arithmetic calculations are meaningful.
Age
Household income
Starting salary
Categorical (Qualitative) Data
Values are the (arbitrary) names of possible categories.
Gender: Female = 1 vs Male = 0.
College major

4. Summarizing Quantitative Data (p.4)

5. Summarizing Quantitative Data: Histogram

6. Histogram vs. Barchart
Histogram applet

7. Summarizing Quantitative Data (p.4)

8. Summarizing Quantitative Data: Summary/Descriptive Statistics
AGE SALARY
Count
Average
Median
Mode
Variance ?
Standard deviation ?
Minimum
Maximum
Range
Lower quartile ?
Upper quartile
Interquartile range ?

9. Percentiles for Salary