Go to the Johnson & Johnson’s investor relations sales andearnings page at www.investor.jnj.com/sales-earnings.cfm. Thecompany reports sales on a quarterly basis, so download allavailable sales reports and set the last four quarters’ salesfigures aside as an “out-of-sample” test group. Use the rest of the“worldwide” historical sales figures to forecast what the last fourquarters’ sales figures would have been expected to be, and thenperform a MAPE analysis on your forecasts. How accurate was yourforecast, and do you think you could have been more accurate if youhad calculated forecasts for each component of worldwide sales(“U.S. consumer sales,” “international pharmaceutical sales,” etc.)separately?
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