The equation for the line of best fit for a data set is y = 2x + 1.5. If the point (1, 4) is in the data set, what is the residual of 1? 0.5 3.5 4.0 7.5

Question

asked Jan 15, 2019 150k views

2 Answers

Daanish · Answer 1 · 2019-01-17T02:58:40+0000

Answer: First option is correct.

Explanation:

Since we have given that

y=2x+1.5

If the point (1,4) is in the data set.

we need to find the residual of 1.

At x = 1,

$y=2x+1.5\\\\y=2* 1+1.5\\\\y=2+1.5\\\\y=3.5$

So, At x = 1, the value of y = 3.5

As we know that

$Residual\ value=Estimate\ value-Actual\ value\\\\Residual\ value=4-3.5\\\\Residual\ value=0.5$

Hence, The residual of 1 is 0.5.

Thus, First option is correct.

Famzah · Answer 2 · 2019-01-21T02:46:18+0000

It is related to econometrics, however using simple algebraic logic we can solve this problem. General formula with residual is
y=2x+1.5+r

, where r is a residual. Plugging the pair into the formula, we obtain that
4=2*1+1.5+r

and r=0.5