Which of the following is a difference between a hypothesis test with the t statistic and a test with a z-score?
1. You must calculate the sample variance (or standard deviation) for the t statistic but not for the z-score
2. You must know the population variance (or standard deviation) for the z-score but not for the t statistic
3. You must use a different table to find critical values for the t test than for the z-score test.
4. All of the other options are differences.