Problem 3-7 (Static) Freight car loadings over an 18-week period at a busy port are as follows: Week 1 Number 220 Number 350 2 245 360 400 380 420 450 3 4 5 6 280 275 300 310 Y = Week 7 89012 11 Week 13 14 15 + 16 17 18 Click here for the Excel Data File a. Determine a linear trend line for expected freight car loadings. (Round your intermediate calculations and final answers to 2 decimal places.) t Number 460 475 500 510 525 541

Please answer A,B, and C

Freight car loadings over an 18-week period at a busy port are as follows: Click here for the Excel Data File a. Determine a linear trend line for expected freight car loadings. (Round your intermediate calculations and final answers to 2 decimal places.) b. Use the trend equation to predict expected loadings for weeks 20 and 21 . (Round your final answers to 2 decimal places.) c. The manager intends to install new equipment when the volume exceeds 800 loadings per week. Assuming the current trend continues, the loading volume will reach that level in approximately how many more weeks? (Use the rounded answers, as required, from any previous part of this problem. Do not round any other intermediate calculations. Round your final answer to 2 decimal places.)