4. Carry out a simulation experiment using a statistical computer package or other software to study the sam- pling distribution of X when the population distribution is Weibull with a 2 and -5, as in Example 5.20. Consider the four sample sizes 5, 10, 20, and 30, and in each case use 1000 replications. For which of-these sample sizes does the X sampling distribution appear to be approximately normal?