I did an experiment. Here are the results.

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I like to do mini-experiments, like seeing how long a stop light is red at various intersections. It turns out (here) that even a really "bad" stop light is really only red for 1 1/2 minutes. Maybe two minutes at the worst. Recently, I have grown impatient with my AM news radio station (KCBS). When I click over to the news station (in my truck) It seems there is always an advertisement playing. I then click back to my public FM classical music station. Ah,,music. I decided to try a "controlled" experiment. Every time I switched from AM to FM, or vice versa, I checked both stations to see whether they were presenting news/music or running an ad For public radio, an ad was defined as thanking their sponsors/donors or asking for a donation I guess you could call it a "paired" design. I didn't write anything down, as I was driving while I collected data My conclusion was that AM radio is about 45 percent ads, while public radio is about 5 per cent ads. ---to be continued...