What are the excel formulas for question: Use the confidence-norm for the statistical analysis for firebox sales per month Firebox Sales by MonthMonthFirebox Deluxe ComboFirebox Upgrade Kit1 $1,139.87 $59.972 $2,409.72 $99.953 $3,389.17 $99.954 $3,091.43 $139.935 $3,879.28 $765.626 $6,078.88 $787.607 $3,660.29 $631.688 $3,552.34 $527.749 $4,481.21 $693.6510 $3,051.44 $493.7511 $3,469.39 $549.7212 $4,563.21 $411.7913 $3,795.36 $154.92Howard, the manager of QuickStove, LLC, has decided to examine the relationship between sales for Firebox combo sets and Firebox upgrade kits. He has compiled 13 months of sales data for both items. Conduct the requested statistical analyses to examine the nature of the relationship between combo sales and upgrade sales. After conducting some market research, Howard is confident that Firebox combo kit sales will total about $4,600 next month. Based on the relationship between combo sales and upgrade sales, project the likely upgrade kit sales for next month. Construct a 95% confidence interval for your projected upgrade sales next month.