Polling experts are raising concerns about a new survey thatfound
nearly 20% of American college students believe it’s appropriate
to use violence to silence offensive speech. […]
However, his survey was not administered to a randomly selected
group of college students nationwide, what statisticians call a
“probability sample”. Instead, it was given to an opt-in online
panel of people who identified as current college students.
“If it’s not a probability sample, it’s not a sample of anyone,
it’s just 1,500 college students who happen to respond,” Zukin
said, calling it “junk science”.
“It’s an interesting piece of data,” Michael Traugott, a polling
expert at the University of Michigan’s Center for Political
Studies, said. “Whether it represents the proportion of all
college students who believe this is unknown.”