Assume the following daily closings for the Dow Jones Industrial Average:

a. Calculate a four-day moving average for Days 4 through 12.
b. Assume that the index on Day 13 closes at 13,300. Would this signal a buy or selldecision?

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Date Price Date Price Date 5/3 5/4 5/5 5/6 5/9 5/10 Price 4/18 4/4 4/5 4/6 281 28 28 293 301 301 352 37 4/19 261 28 281 4/20 4/21 4/22 4/25 4/26 4/27 4/28 36 35 4/8 281 4/12 4/13 5/12 5/13 32