An animal trainer obtained the following sample data (Table A) in a study of reaction times of dogs (in seconds) to a specific stimulus. He then selected another group of dogs that were much older than the first group and measured their reaction times to the same stimulus. The sample data is shown in Table B.
Table A Table B
Classes
Frequency
Classes
Frequency
2.3-2.9
4
2.3-2.9
23
3.0-3.6
6
3.0-3.6
2
3.7-4.3
37
3.7-4.3
15
4.4-5.0
41
4.4-5.0
10
5.1-5.7
7
5.1-5.7
3
5.8-6.4
6
5.8-6.4
32