Which of the following is true about z-scores and a t-scores for computing statistical tests for a mean? a. You compute them in the same way, but evaluate the probabilities of observing them on different distributions. b. t-scores can be used for proportions. c. They are the same in all respects. d. The probability based on a t-score will always be less than the probability based on the same z-score. e. You compute them in different ways, but evaluate probabilities of observing them on the same distributions. f. They both are evaluated through normal probabilities, but with different deviations.