Question

Question Below :D

Answer 1

Sorry, the table makes no sense to me.

Answer 2

That's alright.... I think I got it anyways! Thanks for trying :D

Answer 3

test of independence, is a chi squared test.

if we view this 2x2 as a matrix, then the t.s. can be calculated as the square of the determinant, times n, divided by the product of the totals for each row/col

a b | a+b
c d | c+d
-----------------
a+c b+d | n

\[\chi^2=\frac{n|A|^2}{(a+b)(a+c)~(c+d)(b+d)}\]

Answer 4

http://math.hws.edu/javamath/ryan/ChiSquare.html