Questions
"Three people I know don’t like pineapple on pizza. Nobody likes it!"
Yes, sample size is too small.
“I knew a guy who went to jail for assault. He used to play video games all the time. This just proves my point that video games cause people to become violent. ”
Yes, broad conclusion off a small sample size.
"Out of 1,000 surveyed drivers, 78% say they prefer electric cars. So, electric cars are becoming more popular."
No, there is sufficient mathematical evidence.
“Numerous studies in psychology have shown that students who average at least 8 hours of sleep before a test generally perform better than those who did not sleep well”