^ I am not suggesting that the 11 out of 30 isn't "significant" in the colloquial sense of the word (I think it certainly is), but, in statistics (as used here), "significant" has a specific meaning.
I agree. Just because it isn't statistically significant doesn't mean Tascam shouldn't take notice.
Absolutely. Really, I think you would be hard-pressed to envision a scenario in which 11 out of 30
isn't statistically significant. For example, if you assume an incredibly high expected problem rate of 10% (and, at that level, it would be criminal for Tascam to be selling them), the probability of observing more than 8* failures in 30 observations is 0.00002. As I mentioned earlier, the survey is probably a bit biased, as people with problems are more likely to participate, but that is a tiny probability...
[* The 8 is the number of actually observed incidents, 11, minus the expected number at 10% failure (30 * 0.1 = 3), so the "excess" incidents.]