The difference between a random variable and a probability distribution is that Select one: a. a random variable include the probability of an event O b. a probability distribution can only assume whole numbers O c. a random variable can only assume whole numbers O d. a random variable does not include the probability of an event Knowledge of possible errors, point estimate and degree of confidence is classified as_ Select one: O a. confidence interval O b. interval estimation O c. both interval estimation and confidence interval O d. hypothesis testing An industrial designer wants to determine the average amount of time it takes an adult to assemble an "easy to assemble" toy. A sample of 16 times yielded an average time of 19.92 minutes, with a sampl standard deviation of 5.73 minutes. Assuming normality of assembly times, provide a 95%% confidence interval for the mean assembly time. Select one: O a. (15; 20) O b. (5.73: 10.5) O c. (17: 23) O d. (19.92; 95)