Demand for stereo headphones and MP3 players for joggers has caused Nina Industries to grow almost 50 percent over the past year. The number of joggers continues to expand, so Nina expects demand for headsets to also expand, because yet, no safety laws have been passed to prevent joggers from wearing them. Demand for the players for last year was as follows:  MONTH          DEMAND (UNITS)  January                4,220  February              4,320  March                  4,020  April                     4,420   May                     5,020  June                    4,720  July                     5,320  August               4,920  September         5,420  October             5,720  November         6,320  December         6,020 Using linear regression analysis, what would you estimate demand to be for each month next year? (Round two decimal places)  To be reasonably confident of meeting demand, Nina decides to use 3 standard errors of estimate for safety. How many additional units should be held to meet this level of confidence?

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Demand for stereo headphones and MP3 players for joggers has caused Nina Industries to grow almost 50 percent over the past year. The number of joggers continues to expand, so Nina expects demand for headsets to also expand, because yet, no safety laws have been passed to prevent joggers from wearing them. Demand for the players for last year was as follows: 

MONTH          DEMAND (UNITS) 

January                4,220 

February              4,320 

March                  4,020 

April                     4,420  

May                     5,020 

June                    4,720 

July                     5,320 

August               4,920 

September         5,420 

October             5,720 

November         6,320 

December         6,020

  1. Using linear regression analysis, what would you estimate demand to be for each month next year? (Round two decimal places)
  2.  To be reasonably confident of meeting demand, Nina decides to use 3 standard errors of estimate for safety. How many additional units should be held to meet this level of confidence? 

(Please round to nearest whole number) 

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