Cost of Health Care ~ Have you or a member of your immediate family put off medical treatment due to cost during the past year? In 2016, a survey asked 967 randomly selected American adults this question and 184 said yes. In 2019, another survey asked the same question to 1,015 randomly selected American adults and 253 said yes.

We want to determine if there is a difference between the proportion of Year 2016 American adults and Year 2019 American adults, who put off medical treatment due to cost.

Notation: 1= Year 2016 and 2=Year 2019

A normal distribution is used to carry out a hypothesis test for this scenario.

What is the test statistic for this hypothesis test?