further stats 4

Question 1

contigency tables

Answer 1

expected = collum total x row total
total
contribution = (observed - expected)^2
expected
x^2 = sum of contributions
deg of frequency = (m-1)(n-1)
expected frequencies must be at least 1 if not combine
X^2 cv reject ho

Question 2

goodness of fit

Answer 2

testing wether it fits a dist
for poisson if you estimate lamda you minus 1 from deg of fred = no of groups -1
x^2 > crit value reject ho
if p < crit reject ho