Part 1: The Atlantic Tire and Muffler Company introduced a new line of all-season tires in January of Year 1. This line proved very popular and there has been strong growth in sales. The table below shows the sales numbers (in 1000s of units) by three-month period in Years 1 and 2. Year 1 1 1 1 2 2 2 2 Period Jan-Mar Apr-Jun Jul-Sept Oct-Dec Jan-Mar Apr-Jun Jul-Sept Oct-Dec t 1 2 3 4 5 6 7 8 Sales 23 47 55 80 82 128 136 157 1. Using linear regression, what is the slope of the best fit line to the sales data? 2. Using linear regression, what is the intercept of the best fit line to the sales data? 3. If the best fit line is used to forecast the sales in Apr-Jun Year 3, what is the forecast sales figure (in 1000s of units)? 4. What is the forecast for sales in Apr-Jun Year 3 (in 1000s of units) if the forecast is adjusted with an additive adjustment? 5. What is the forecast for sales in Apr-Jun Year 3 (in 1000s of units) if the forecast is adjusted with a multiplicative adjustment?

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