Question

Graphing and residual plot question: Show all work

Answer 1

Well you can tell just by the table that the association is positive..

Answer 2

ok so we can agree 6. is positive

Answer 3

Yes.

Answer 4

I can guide you on finding the correlation, but I can't tell you the answer. What you want to do is find the mean (average) of x and y. Once you have your mean of your "x" values you will subtract the mean from every individual x-value that you have..

For example, if your x-values were 1 2 and 3, the average of those is 2, so you would do (1-2) (2-2) (3-2) etc..

Answer 5

Use this as a guide..

Answer 6

ok I see, but I dont see what to caluucate

Answer 7

And this is your scatterplot..

Answer 8

What do you mean? You calculate the numbers in your table..

Answer 9

I know but how do you know what to do them by?

Answer 10

hmm maybe its the operations

Answer 11

Well like I said earlier, find your average of x and then average of y..

your average of x is 1.83
your average of y is 2.86

Now you will subtract your average of x from every x-value..
(.3 - 1.83), (.85 - 1.83), (1.50 - 1.83), (2.50 - 1.83), (4.0 - 1.83) and solve those..

so then do the same for y..

Answer 12

(.8 - 2.86), (2 - 2.86), (2.5 - 2.86), (3 - 2.86), (6 - 2.86) and solve..

Answer 13

ok give me a second

Answer 14

Tell me what you get for the x values, then the y when you get them.

Answer 15

-1.53 , -0.98 , -0.33 , 0.67 , 2.17

Answer 16

-2.06 , -0.86 , -0.36 , 0.14 , 3.14

Answer 17

Alright, good.

Now what you need to do next is multiply your x and y values with each other.. so

-2.06(1.53)= ?

-.86(-.98)=?

-.36(-.33)=?

.14(.67)=?

3.14(2.17)=?

Answer 18

you will also square your x and y's .. so..

-1.53 squared =?
-.98 squared =?
and so on, but like I said do it for x and y

Answer 19

-3.1518 , 0.8428 , 0.1188 , 0.0938 , 6.8138

Answer 20

Now add those up ^ and tell me the final sum of them. And that will be one step out of the way for a moment. (sorry I know it is a lot of work)

Answer 21

4.7174

Answer 22

Alrightey. Now go ahead and square your x and y's and then add all the x's together then add all the y's together and tell me what you get.. (almost done!)

Answer 23

That's for x, correct?

Answer 24

What isn't?

Answer 25

8.42 isnt right

Answer 26

Let me grab my calculator and work out the x's and y's. Just go ahead and try the y's and I will check it. :P

Answer 27

ok

Answer 28

I got 6.4294 for the x's..

Answer 29

i am getting undefiend for y and x

Answer 30

You may be entering them wrong..
I also solved the y's and got 4.7664

So let's just go on from there..

Answer 31

So now you have..
4.7174 which is what you got from multiplying x(y) 's
6.4294 from squaring the x's
& 4.7664 from squaring the y's

What you will do next is add up all three of those numbers..

Answer 32

So tell me what you get when you add them.

Answer 33

@Howard-Wolowitz still there? c:

Answer 34

yes im just thinking about how to do it

Answer 35

Just add up 4.7174 + 6.4294 + 4.7664

Answer 36

When you add them up you get 15.9132

Answer 37

15.9132

Answer 38

Yes.. One more step and you're pretty much done!

Answer 39

Bazinga