Question

@jim_thompson5910

Answer 1

Do you know stats?

Answer 2

@jim_thompson5910

Answer 3

I know some stats, but not all. It will depend on the problem.

Answer 4

i have the question and answer but i do not understand how we got the answer

Answer 5

it's 9 but why?

Answer 6

one sec while I think

Answer 7

according to this page

http://onlinestatbook.com/2/chi_square/contingency.html

we simply add up the values in column 1 to get 8+6=14
then we add the values in row 1 to get 8+17 = 25


Afterwards, we multiply 14*25 = 350, then divide by 39 to get 350/39
8.97435897435898 which rounds to 9

Answer 8

This is from the part that says

E = (Ti * Tj)/T

where

E = expected value in cell i,j (row i, column j)
Ti = sum of all the values in row i
Tj = sum of all the values in column j

Answer 9

THANK YOU!

Answer 10

you're welcome

Answer 11

also one more question

Answer 12

what's that?

Answer 13

it has to do with degrees of freedom

Answer 14

i was thinking it was 3 since there are 4 categories so you must do 4-1=3?

Answer 15

from this page

http://www.ling.upenn.edu/~clight/chisquared.htm

it says...

"The degrees of freedom for a Chi-square grid are equal to the number of rows minus one times the number of columns minus one: that is, (R-1)*(C-1). In our simple 2x2 grid, the degrees of independence are therefore (2-1)*(2-1), or 1!"

Answer 16

so it basically says

df = (R-1)*(C-1)

df = degrees of freedom
R = # of rows
C = # of columns

Answer 17

but i thought it had to do with the # of categories rather than columns and rows?

Answer 18

okay so im guessing it would be like this (3-1)*(3-1)= 4 Df=4

Answer 19

I think that's if you have like 2 columns of data maybe (and each row can be interchanged)

Answer 20

or would i have to foil?

Answer 21

it's a 2x2 table

Answer 22

so R = 2, C = 2

Answer 23

df = (R-1)*(C-1)

df = (2-1)*(2-1)

df = 1*1

df = 1

Answer 24

i think you forogt about the column including complained,no,yes

Answer 25

so it would be 3x3

Answer 26

but that's not a data column, it's just a label

Answer 27

so you can know what each row means

Answer 28

ohh!

Answer 29

haha so yeah (2-1)x(2-1) = DF=1

Answer 30

you're amazing hopefully you have time for one more?

Answer 31

sure I can do one more

Answer 32

but, when i give the question let me do it on my own and you correct me. lol

Answer 33

alright

Answer 34

Z=XBAR-Mean/standard deviation SQuareroot n

Answer 35

is this the right equation?

Answer 36

no, first you must use this formula

\[\Large \chi^2 = \sum_{i=1}^{n} \frac{(O_i - E_i)^2}{E_i}\]

to compute the chi-square test statistic

Answer 37

the formula is given on that same page posted above

http://www.ling.upenn.edu/~clight/chisquared.htm

Answer 38

so you'll need the expected frequencies for each cell