1. Which of the following is a difference between the t-distribution and the standard normal distribution? a. The standard normal distribution is dependent on parameters like degree of freedom, while the t-distribution is not. b. The t-distribution cannot be calculated without a known standard deviation, while the standard normal distribution can be. c. The t-distribution has a larger variance than the standard normal distribution. d. The standard normal distribution's confidence levels are wider than those of the t-distribution.
2. If a data set has 'c' number of observations, the relative frequency of category 'l' is computed as: a. sum of ('c' + each observation in category 'l') b. (frequency of category 'l') / 'c' c. 'c' * (number of observations in category 'l') d. (sum of all observations in category 'l') / 'c'