How have stocks performed in the past? The following table presents the data stored in Stock Performance, which show the performance of a broad measure of stock performance (by percentage (by per percentage) for each decade from the 1830s through the 2000s:
a. Plot the time series.
b. Fit a three-period moving average to the data and plot the results.
c. Using a smoothing coefficient of
d. What is your exponentially smoothed forecast for the 2010s?
e. Repeat (c) and (d), using
f. Compare the results of (d) and (e).
g. What conclusions can you reach concerning how stock have performed in the past?
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Basic Business Statistics, Student Value Edition
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