Question 21 of 41
Q.
The information about death rate of a state in different years is given in the following table. Fit a linear equation to find trend and hence estimate the death rate for the year 2023.
| Year | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 |
|---|---|---|---|---|---|---|---|
| Death rate | 7.6 | 6.9 | 7.1 | 7.3 | 7.2 | 6.9 | 6.9 |
Gujarat GsebGujarat Board (GSEB) HSC Commerce Board 2022Subjective· 5mImportance★★★★★
51% · 21/41 Questions
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Start your 14-day free trial to unlock the full solution →Origin 2018, , ; , ; ; 2023 (): .
Data (): Years 2015–2021; death rate : 7.6, 6.9, 7.1, 7.3, 7.2, 6.9, 6.9.
Coding: take the middle year 2018 as origin (), unit = 1 year.
| Year | ||||
|---|---|---|---|---|
| 2015 | 7.6 | -3 | 9 | -22.8 |
| 2016 | 6.9 | -2 | 4 | -13.8 |
| 2017 | 7.1 | -1 | 1 | -7.1 |
| 2018 | 7.3 | 0 | 0 | 0 |
| 2019 | 7.2 | 1 | 1 | 7.2 |
| 2020 | 6.9 | 2 | 4 | 13.8 |
| 2021 | 6.9 | 3 | 9 | 20.7 |
| Σ | 49.9 | 0 | 28 | -2.0 |
Step 1 — constants (since ). …
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