Among a sample of 25 subjects what is the minimum number of

Question

1. In general, will the Winsorized sample variance,S_w² , be less than the sample variance, s2?

2. Among a sample of 25 subjects, what is the minimum number of subjects that must be altered to make the sample variance arbitrarily large?

3. Repeat given Exercise but for S_w² instead. Assume 20% Winsorization.

Exercise
Among a sample of 25 subjects, what is the minimum number of subjects that must be altered to make the sample variance arbitrarily large?