3. List the steps involved in purchasing a major item like a car or appliance. Then estimate the time required for each step using rule-of-thumb estimating. b. Now, estimate the time for each step in part a using the formula (TE = (0 + 4M + P) = 6), where O is optimistic, P is pessimistic, and M is most likely duration. In your opinion, are these results more accurate than those in part a? Why or why not