Problem 3 Economic future: A Heartland Monitor poll taken in December 2016 obtained responses from 990 adult Americans to the question "How would you rate the current state of the economy? Is it excellent, good, fair, or poor?" The following table presents the results, along with the proportions of people who gave these responses in 2015. View 2015 Proportion 2016 Frequency Excellent 0.01 20 Good 0.20 273 Fair 0.46 414 Poor 0.33 283 Can you conclude that the proportions of people giving the various responses changed between 2015 and 2016? Use the 0.01 level of significance.

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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.