A sample of n = 4 scores has SS = 60. What is the variance for this sample?

A sample of n = 4 scores has SS = 60. What is the variance for this sample?
 
  A) 30
  B) 20
  C) 16
  D) 15

Question 2

For a fixed level of significance, the critical value for the chi-square will ____.
 
  A) increase as the df value increases
  B) decrease as the df value increases
  C) increase as the sample size increases
  D) decrease as the sample size increases

Question 3

If two samples are selected from the same population, under what circumstances are the two samples guaranteed to have exactly the same t statistic?
 
  A) If the samples are the same size and have the same variance
  B) If the samples are the same size and have the same mean
  C) If the samples have the same mean and the same variance
  D) If the samples are the same size and have the same mean and have the same variance