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, as yet, no safety laws hove been possed to prevent joggers from wearing them. Demand for the players for last year wos as follows b. Using lineat regression onalysis, what would you estimote demand to be for each month next year? (Do not round intermediate calculations. Round your answers to 2 decimal ploces.) b. To be reasonably confident of meeuing demand, Nina decides to use 2 standard errors of estimate for safety. How many additional inits should be held to meet this level of confidence? (Do not round intermediate calculations. Round your answer to the nearest Whole number.)