Question
Following data is collected on dependent variable ( $Y$ ) and independent variable ( $X$ ):
$n=20 ; \operatorname{Cov}(x, y)-120 ; S_{x}=10 ; S_{y}=20 ; \bar{x}=105, \bar{y}=90$
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
| Year | $2008$ | $2009$ | $2010$ | $2011$ | $2012$ | $2013$ | $2014$ |
| Average annual income $(Rs. 10,000)$ | $36$ | $40$ | $48$ | $52$ | $60$ | $80$ | $95$ |
| Marks of understanding English grammar $(x)$ | $28$ | $15$ | $5$ | $10$ | $15$ | $25$ | $15$ | $20$ |
| Marks of understanding Gujaratigrammar $(y)$ | $27$ | $10$ | $22$ | $20$ | $6$ | $14$ | $10$ | $8$ |