26. Abortion policy: A Gallup poll taken in May 2016 asked 1025 adult Americans to state their opinion on the availability of abortions. The following table presents the results, along with the proportions of people who held these views in 2010. Opinion 2010 Proportion 2016 Frequency Generally available 0.24 297 Available with limits 0.54 513 Should not be permitted 0.19 195 Don’t know/No answer 0.03   20 Can you conclude that the proportions of people giving the various responses changed between 2010 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.