Page 37 - Quantitative Data Analysis

Quantitative Data Analysis
Simply Explained Using SPSS

5-number Summary

1. Minimum – smallest number

2. 1 quartile (Q 1) – number that divides the lower 25% of the
st
data from the upper 75% of the data

3. Median (2 quartile, Q 2) – number that divides the lower
nd
50% of the data from the upper 50% of the data
observations in half

rd
4. 3 quartile (Q 3) – number that divides the lower 75% of the
data from the upper 25% of the data

5. Maximum – largest number

NOTE: to create a five number summary observations
must be listed in order from least to greatest!
Box Plots
1. A graph of the five-number summary
2. A central box spreads the quartiles (Q 1 and Q 3)

3. A line in the box marks the median (M)

4. Lines extend from the box out to the minimum and
maximum observations

The Theory and Applications of Statistical Inferences 21