Frequency Distribution Table Examples Continued
Example 2:
In a second test, the same psychologist wonders how long it takes 20 children to color a set of drawings. She now records the following scores in minutes:
31, 43, 36, 29, 41, 40, 33, 37, 28, 39, 30, 44, 35, 28, 40, 39, 32, 36, 27, 38
The following grouped frequency distribution table displays these scores.
The following grouped frequency distribution table displays these scores.
X |
f |
p = f/N |
Percentage = p x 100 |
25-29 |
4 |
0.2 |
20% |
30-34 |
4 |
0.2 |
20% |
35-39 |
7 |
0.35 |
35% |
40-44 |
5 |
0.25 |
25% |
N = 20, the sum of p is 1.0, and the sum of the percentages is 100% in this example.
For these same data, the following grouped frequency table with smaller intervals would also be acceptable:
X |
f |
p = f/N |
Percentage = p x 100 |
26-27 |
1 |
0.05 |
5% |
28-29 |
3 |
0.15 |
15% |
30-31 |
2 |
0.1 |
10% |
32-33 |
2 |
0.1 |
10% |
34-35 |
1 |
0.05 |
5% |
36-37 |
3 |
0.15 |
15% |
38-39 |
3 |
0.15 |
15% |
40-41 |
3 |
0.15 |
15% |
42-43 |
1 |
0.05 |
5% |
44-45 |
1 |
0.05 |
5% |