Question

scatter plot help needed

Answer 1

What is your question?

Answer 2

thanks this is really confusing and ill love it if you please explain how to solve this

Answer 3

Let's draw a line of best fit. Take a look here at what I drew http://prntscr.com/bc2s4c

Answer 4

Do you know how to find the y-intercept (b) and the slope (m) to create our equation?

Answer 5

i know its y=mx+b i think but i dont know what to do at this point

Answer 6

Yes, the equation we are using is y = mx + b, and it's OK if you don't know, I'll teach you.

We are going to start by finding the y-intercept (which is b). The y-intercept is the point where the line crosses over the y-axis. Can you give estimate where my line I drew crosses over the y axis? http://prntscr.com/bc2s4c

Answer 7

Make sure to look here http://prntscr.com/bc2tnt

Answer 8

is it about 0,1.10? and thanks again for helping me

Answer 9

Yes, 1.10 will be our y-intercept, so let's put it for b in the equation.

y = mx + 1.10

Now we need to find the slope. Do you know the formula we can use to find the slope?

Answer 10

nope :/

Answer 11

Ok, that's fine. The formula to find the slope is \(\tt \dfrac{x-x_2}{y-y_2} = m \). To use this slope we need to pick two points on the line and plug them into the equation.

Let's use the points (8, 1.32) and (3, 1.2) where \(\tt 8 = x\), \(\tt 1.32 = y\), \(\tt 3 = x_2\), and \(\tt 1.2 = y_2\)

Answer 12

\(\tt \dfrac{x-x_2}{y-y_2} = m\)

\(\tt \dfrac{8-3}{1.32-1.2} = m\)

Do you know how to solve this?

Answer 13

yes, but a question i had was how did you decide to pick those points

Answer 14

I am so sorry. The y is supposed to be on top, so you will be solving

\(\tt \dfrac{1.32-1.2}{8-3} = m\)

Answer 15

Hold on, I think I completely screwed something up... Please, don't continue while I figure out my mistake. I am so sorry!

Answer 16

no biggie! take your time :)

Answer 17

LOL this has to be some kind of troll question ;)

Answer 18

XD

Answer 19

It says it is in thousands, but it is in millions on the graph. The y intercept is supposed to be a decimal, but in the answers it isn't xD

Answer 20

Is it?

Answer 21

LOL

Answer 22

lol im so confused with the question and everything lol

Answer 23

This whole question is screwed up, hah

Answer 24

pretty much, lol the answers are kinda in decimals i guess

Answer 25

And the points only go up 8 years, not 10

What is this??

Answer 26

Please do not cheat on your interim assignment.
That is there to test you on your knowledge on what you have learned and how much you have progressed.

Answer 27

This question shouldn't even be on any test! AH

Answer 28

im not cheating im genuinely confused, im learning off of CompassLearning.com and literally that school doesnt help me at all and im going to this website for help and knowledge. if i wanted to cheat id go to a calculator @jabez177

Answer 29

There is a few things wrong with this problem, so no wonder why

Answer 30

If you can report the question to your teacher or someone, please do
http://prntscr.com/bc3096

Answer 31

http://prntscr.com/bc30oj

Answer 32

thanks i will right now, if it werent for you guys i wouldnt have known that this question is messed up, im going into high school next year and i dont want to be held back for the lack of good curriculum on the website im learning from. i honestly try my hardest but its reflecting the teaching flaws

Answer 33

And the data only goes up to 8 years, not 10.. http://prntscr.com/bc313e

Answer 34

heres another one, is this one messed up too?

Answer 35

That one looks better, lol

Answer 36

btw theres lines between each number on the x axis its just the screenshot looks crappy

Answer 37

But the slope I am getting isn't in one of the choices

Answer 38

now for this one the y intercept is at 0,110 but which two points do i pick to find the slope

Answer 39

Any two points on the line of best fit

Answer 40

the line of best fit would be like this right

Answer 41

Yes, then pick two points on the line and plug them into the equation

Answer 42

troll ._.

Answer 43

can you stop this is a serious question i need help @Comrad

Answer 44

The issue is that the y scale on the graph is in millions while the linear equation models the y value in thousands

in other words

y = 1.12 on the graph means y = 1.12 million (aka 1,120,000)

y = 1.12 from the equation means 1.12 thousand (aka 1,120)

Answer 45

does this mean that this equation is not solvable ?

Answer 46

no it means that we have to rescale things

Answer 47

well i already guessed an answer, thanks for trying to help to those who tried

Answer 48

I'm still not getting the slope they list, so there's probably a typo somewhere

Answer 49

Trust me, I been trying.. There is something wrong with this problem, lol

Answer 50

thanks i appreciate it :)

Answer 51

for your new problem
you can eliminate the two that don't have 110
then, the point on x=8 is a bit too high up to use for the line of best fit
so I tried the x=7 and x=0
the y's of those are 136 and 110 respectively
36 - 10 = 26
taking into account that there is that slightly higher point (and for the sake of mental math) I went with 28 divided by 7
to get the slope

This should get you to a proper answer for once