Students in a communications class studied network television programming and found the average nonprogramming minutes in an hour of prime-time broadcasting for network television was 15:48 minutes.

For cable television, the average was 14:55 minutes.

a. Calculate the difference in the average clutter between network and cable television.

b. Suppose the standard deviation in the amount of clutter for both network and cable television was either 5 minutes or 15 seconds. Which standard deviation would lead you to conclude that there was a major difference in the two clutter averages?

Comment.