8. Fill in the circle next to all the true statements. If the population is normal, a z-test is equivalent to a one sample t-test. An ordinal variable can be described using a mean or median. If I make a 95% confidence interval and a 90% confidence interval for a mean (using the same data for both), the 95% confidence interval will be narrower. In a right-skewed (positively skewed) distribution, the mean is larger than the median. A 95% confidence interval for mu will always contain the sample mean. The central limit theorem only works when I'm sampling from a population that is normally distributed