But the data was improperly restricted to people with experience with both slideout keyboards and virtual keyboards. You can't say anything about the general phone population with this restriction in place.
Why is this a big deal?
I would assume that most people have had experience with more than one phone and probably most people
have considered a physical keyboard at some point. The ones who have actually bought them are probably
more likely to be heavy typers/texters so that biases it a little bit but if 30% of the population...
The first half of your second paragraph shows why it's a big deal. In order to make any sense out of the numbers we have to know how many people have owned slide out keyboards (not just physical keyboards in general) vs the total population, and we don't.
Saying 20% of people who have tried both prefer pepsi over coke makes alot
more sense that saying 95% of people who have tried pepsi like it.
Neither of these answers the question of the viability of the market, so they are both equally poor choices if that is what you are looking for.
There might just be too small of market for people who type/text alot and also are willing to pay for an
I can agree with this.