CORE question 7

[nonstop9328]

shouldn't the answer for question8 core C not B?
it doesn't have the squiggly line on the x axis which means it starts from 20.

[eadvice]

Oh very nice, didnt think of that. Gives back some hope. But if its not be then it will be D why C?

[_avO]

if you meant Q8, then no because the Y-axis is always at x = 0 and therefore the y intercept is at x = 0. All you needed to do was plot the data and find its regression line

[nonstop9328]

but physically foot length can't be 0cm.

[lucaspawpaw]

A y-intercept can't be at x=20. Y-intercept, x=0.

Also, if you're not convinced, if you put the points into the calculator it gave the equation of the line ==> y-int was 141.

[yesimemma]

i substituted two values in to find the rule (24, 172) and (34, 185) which makes it B

[lucaspawpaw]

but physically foot length can't be 0cm.

the regression line is merely used as a prediction - if you extrapolate it predicts that when foot length is 0, height is 141. this isn't necessarily accurate but the regression equation is still what it is.  

did that even make sense? :/

[sam.utute]

shouldn't the answer for question8 core C not B?
it doesn't have the squiggly line on the x axis which means it starts from 20.

but physically foot length can't be 0cm.

the regression line is merely used as a prediction - if you extrapolate it predicts that when foot length is 0, height is 141. this isn't necessarily accurate but the regression equation is still what it is. 
did that even make sense? :/

Answer is definitely B. Gazillion% sure. Common sense dictates it must be thus. I dare you to defy the laws of this universe (specifically, VCAA) and claim otherwise.
Jokes apart, the y-intercept will ALWAYS occur when x=0.

[ynnaej19]

shouldn't the answer for question8 core C not B?
it doesn't have the squiggly line on the x axis which means it starts from 20.

but physically foot length can't be 0cm.

the regression line is merely used as a prediction - if you extrapolate it predicts that when foot length is 0, height is 141. this isn't necessarily accurate but the regression equation is still what it is. 
did that even make sense? :/

Answer is definitely B. Gazillion% sure. Common sense dictates it must be thus. I dare you to defy the laws of this universe (specifically, VCAA) and claim otherwise.
Jokes apart, the y-intercept will ALWAYS occur when x=0.

Yep, y int always at x=0. I was going to ask nonstop to dare defy that law as well but decided against it.