Does talking while walking slow you down? A study considered mean cadence (steps per minute) for subjects using no walking device, a standard walker and a rolling walker. In addition, the cadence was measured when the subjects had to perform dual tasks. The second task was to respond vocally to a signal while walking. Cadence was measured for subjects required to respond who were just walking using no device, a standard walker or a rolling walker, and for subjects to respond to a signal while walking.

a) list the factors and the number of levels of each factor (select all the apply)

1. mean cadence with three levels

2. mean cadence with two levels

3. walking device with three levels

4. task with two levels

5. task with three levels

6. walking device with two levels

b) how many cells are there in the data table?