Question

If you're (me) given a table of values, substitute in into the formula. <-- Made that problem up, not too sure on it though.

Answer 1

so what happens? :DD

Answer 2

I don't' know what value I should put them as D;

Answer 3

The tasks I set myself up for ;_;

Answer 4

are you asking how to find r?

Answer 5

If I can find the the sigma values are i can find R by plugging in :p

Answer 6

what do you mean by sigma values?

Answer 7

Find their values with the given list

Answer 8

Hmm, give me a minute to calculate I guess.

Answer 9

k :3

Answer 10

i'll let wio take this one, too lazy to calculate all that , too much work

Answer 11

pfft >.<

Answer 12

same + it's Valentine's Day

Answer 13

o.0 that doesn't apply to me :l *looks at everyone* ..k :3

Answer 14

use calculator :)

Answer 15

O.O I have the answer U_U I want to know how to do it on paper though ;-;

Answer 16

What value are you talking about? the value of r?

Answer 17

the values of the list I posted above

Answer 18

http://jsfiddle.net/wio_dude/H8aHm/

Answer 19

What is \(r\) supposed to be anyway?

Answer 20

r is the correlation coefficient and yes, the answer was 0.0764 :>

Answer 21

How would you do this on paper though? >.<

Answer 22

do what the formula tells you

Answer 23

._. ^

Answer 24

evaluate ∑(xy), ∑x, ∑y, ∑x^2, (∑x)^2, ∑y^2, and (∑y)^2

Answer 25

Look at my program. It does it really simply.

Answer 26

I mean how did you find those values :o

Answer 27

It just adds things up.

Answer 28

Ok.. how did you find\[\Sigma x\] ?

I know that Σx = Sum of first variable

Answer 29

But what's the first variable?

Answer 30

I add up every \(x\) value.

Answer 31

\[
\sum x= 11+18+17+\ldots
\]

Answer 32

Happy Valentines Days @shamil98 @UsukiDoll @hartnn

Answer 33

\[\sum\] indicates summation of values

Answer 34

HAPPY SINGLE AWARENESS DAY!

Answer 35

^

Answer 36

Well, I am single. But I don't know about you guys.

Answer 37

Oh ok x)

Answer 38

@tHe_FiZiCx99 now you know how to find all those ?
\(\sum x, \sum x^2 , \sum y , \sum y^2, \sum xy \)
any doubts ?

Answer 39

\[\sum xy\] means summation of all products of x and y
\[\sum x^2 or \sum y^2\] means summation of square of x and summation of y, respectively.

Answer 40

it a kind of direct substitution

Answer 41

I'm curious how to find Σxy

And Σx^2 would be adding all of x's and squaring them?

Answer 42

I think for Σxy is the sum of x * y

Answer 43

nopes,
\(\sum xy = 11*6+18*8+17*10+... \)
\(\sum x^2 = 11^2+18^2+17^2+...\)
\(\sum y^2 = 6^2+8^2+10^2+...\)

Answer 44

Yeah you got it right. \[\sum xy = x_{1}y _{1}+x _{2}y _{2}+...\]

Answer 45

Ohhh >-<

Answer 46

Yeah it makes more sense now :* ty

Answer 47

sum x^2
square all x's and then take the sum

Answer 48

Ah, kk thanks :*

Ty everyone who bothered looking at it <~~(^^)~~>

Answer 49

x = the first variable, that would be 11 in this case?
y = the second variable, that would be 6 in this case?

Answer 50

yea

Answer 51

and Ex would be 11 also?

Answer 52

Σx *

Answer 53

@Yttrium

Answer 54

No, you have to add all x's

Answer 55

Ok, and N would be 10 or 20 ?

Answer 56

10

Answer 57

look at this http://jsfiddle.net/wio_dude/H8aHm/

Answer 58

kk ty, and I forgot wio gave me his link lol >.<