To test the claim using two proportion z test.
Each month the National Association of Purchasing Managers publishes NAPM index. One of the problems asked on the survey to purchasing agents is: Do you think the economy is expanding? Last month, of 300 responses, 160 answered yes to the problem. This month, 170 of the 290 responses indicated they felt the economy was expanding. At the .05 significance level, can we terminate that a larger proportion of the agents believe the economy is expanding this month?