Question
State the utility of regression.
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| Item | Saree | Dhoti | shirting | other |
| Unit | Piece | piece | meter | Meter |
| Quantity in year $2020$ | $5$ | $8$ | $20$ | $15$ |
| Price in year $2020 (₹)$ | $300$ | $70$ | $32.40$ | $20.90$ |
| Price in year $2021 (₹)$ | $400$ | $100$ | $38$ | $23.80$ |