According to the 2005-2006 National Pet Owners Survey, only 16% of dogs were adopted from an animal shelter and 15% of cats were adopted.  To test this difference in proportion of adopted pets, a survey was taken from a local county.  Is there sufficient evidence to conclude there is a difference in proportions?  Use α = 0.05 What is the z-score for this test?           dogs cats Number in shelter 180 200 Adopted 36 30

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2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.