| Gnizmo said: Its not the same, but it gives the same result. I am too tired to go into the specifics, so on some of this I ask you to take me at my word. Failing that you should be able to find some mathematical proofs that back me up with a bit of googling. Sorry for the laziness, but I am running dead tired lately. What you are looking for with sample is to get, essentially, a small scale version of the larger population. For example, if the population is 10% musicisans then you would want 10 people to be musicians in a sample of 100. This does not always work out as probability does not work over the short term. You can flip a coin 10 times and easily have it land on the same side each time. This poses a large potential problem that kind of corrects itself. As it turns out over a large number you start seeing the laws of probability kick in. Flip a coin a hundred times and it will be very close to 50%. On a small scale it is easy for a few improbably picks to skew the results dramatically. A sample size of hundred is thrown off 1% for every odd answer. Increase it to just 500 though and it is down to 0.2%. As a result you get a slower growth for sample size needed to iron out a possible random selection bias. You just are not that likely to get 1 of the 6,000 people with one eye in a population of 20 million with two eyes. You do want to increase the size to account for the increase in general population, but not even close to a perfect correlation. Hopefully this isn't too confused. I am sleep deprived, in pain, and hopped up on codine so it takes a lot of effort to think clearly. I am certain Demotruk will clarify anything I leave vague. |
But we don't know that this sample is accurate like you described. For all we know, half of the Wii's could have been used less than an hour a day, and only 10% of PS3s and 5% of 360s. And there are several factors in the equation- usage time, storage conditions, country, care when handling, etc. We don't know that this sample is any good. I mean, the title could at least state that this was a survey of 16,000 people.
I also highly doubt more 360s succumb to disc read errors than RROD...










