Problem 3-2
National Scan, Inc., sells radio frequency inventory tags.Monthly sales for a seven-month period were as follows:
| Month | Sales (000)Units |
| Feb. | 14 |
| Mar. | 17 |
| Apr. | 11 |
| May. | 19 |
| Jun. | 21 |
| Jul. | 22 |
| Aug. | 26 |
b. Forecast September sales volume using each of thefollowing:
(1) A linear trend equation.(Round your intermediatecalculations and final answer to 2 decimal places.)
Yt thousands
(2) A five-month moving average. (Round your answer to 2decimal places.)
Moving average thousands
Problem 3-7
Freight car loadings over an 18-week period at a busy port areas follows:
| Week | Number | Week | Number | Week | Number |
| 1 | 370 | 7 | 415 | 13 | 450 |
| 2 | 380 | 8 | 425 | 14 | 455 |
| 3 | 390 | 9 | 435 | 15 | 475 |
| 4 | 380 | 10 | 425 | 16 | 485 |
| 5 | 390 | 11 | 435 | 17 | 495 |
| 6 | 395 | 12 | 445 | 18 | 505 |
a. Determine a linear trend line for expected freight carloadings. (Round your intermediate calculations and finalanswers to 2 decimal places.)
YˆY^ = + t
b. Use the above trend equation to
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