Question 1043848
2 sample proportion test:
Ho p1=p2
Ha: p1-p2=0
alpha=0.001
Test statistic is z
Critical value |z|>3.29
z=(p1-p2)/SE
where SE = sqrt[p(1-p){(1/n1)+(1/n2)}]
p1=0.561
p2=0.746
pooled is 0.666
without rounding until the end, SE is 0.0479
p1-p2=-0.185
z=-3.86.
This is significantly different at the 0.001 level, so that we conclude the samples came from different populations or that there was a significant change between the two samples.
On a calculator, use STAT TESTS and 6, 2-Prop Z-test