Question

一道简单的英文版统计题，英语好统计好的大神快来！在线等！

The scores on a placement test given to college freshmen for the past five years are approximately normally distributed with a mean μ=74 and a variance σ^2=8. Would you still consider σ^2=8 to be a valid value of the variance if a random sample of 20 students who take the placement test this year obtain a value of s^2 = 20?

Answer 1