please state what each value is. show all steps. thanks

A company that manufactures shuttle cars and mines for the coal mining industry has determined that "coal production in the US" is a fairly reliable three-quarter leading indicator of their sales. This quarter's coal production in the US can be obtained from the Department of Energy and it is used to obtain a forecast of their shuttle car and miner sales nine months from now. For the data provided, determine a linear equation based on regression analysis and prepare a forecast of company sales three quarters from now. Click the icon to view the data for the future sales and coal production. The coefficient bois (Round to three decimal places.) The coefficient b, is (Round - More Info Quarter, t. 1 2 3 4 Future Sales (units/quarter), t+3 337 366 241 415 419 371 346 273 291 472 ? Coal Production in the US (103 tons/quarter), Xt 165 143 107 187 236 162 211 121 111 263 191 5 6 7 8 9 10 11 (now)