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Null hypothesis
There is NO statistically significant difference between expected & observed data.
Accept Null
If x2 less than critical value
Reject Null
If x2 is greater than critical value (then it’s statistically significant)
TT x tt
1
Tt x tt
1:1
Tt x Tt
3:1
AABB x aabb
1
AaBb x aabb (test cross)
1:1:1:1
AaBb x AaBb
9:3:3:1