Question

1)Graph the data as a scatter plot.
2)Draw a line through the middle of the points plotted. It does not need to connect all of the points.
ok after that
is this rule right?
3)Use two of the points on the line and the point-slope formula, y−y1=m(x−x1), to write the equation of the line

Answer 1

My question is that my teacher says there is something in the middle of step 2 and 3 he says I am missing something right before i do that.

Answer 2

He declines the rule that comes after the 2nd one
He keeps telling me that i am missing something but i am looking for it tho not finding it
-_-

Answer 3

This is To calculate a line of best fit for a set of data:

Answer 4

I'd be glad to help, but to do that I'd need to see the plot of data points, your line, your calculations and so on. Have you any way of sharing them? I don't know off hand what you're missing, if anything.

Answer 5

No, its just to calculate the line of best fit

Answer 6

weird, maybe he's looking for more specifics on step two about how it needs to be a line of best fit, (or a trend line)

Answer 7

How has your instructor done that in class demonstrations? Does he or she allow use of a calculator?

Answer 8

if not, then you'll have to use a rather cumbersome set of formulas to find the best fit line.

I see you're supposed to "pick any two points on the line" and find the slope of that line based upon those points. That's an appropriate but less sophisticated approach.

Answer 9

well it was a phone call
he asked me what i do after graphing
then i draw a line
then use two points

Answer 10

Yes, and that would be for the purpose of approximating the slope of the "best fit" line.

Answer 11

but for some reason he says there is something between them like right before i go to the two points he says there is something before that...

Answer 12

ohhhh

Answer 13

so i approximate the slope of the "best fit" line?

Answer 14

can you explain a bit more please?

Answer 15

My suggestion: If you have any class notes, review them and see what that "other something " might have been.

Well, you've found the slope of a line thru 2 given points.
Approx. the slope of the best fit line is done in the same way.

The only other thing that comes to mind is that you need to judge whether the points you've plotted seem to line on a str. line, or whether the pattern they make seems to be a curve.

Answer 16

http://i.imgur.com/1ev09W2.png

Answer 17

http://i.imgur.com/DQURUZL.png

Answer 18

???

Answer 19

Sounds as tho your instructor wants you to show all the residuals. Have you done this before? Make certain you're clear what "residual" means in this context.

Answer 20

Thank You So Much!!!
@mathmale

Answer 21

My pleasure!!