A pharmaceutical manufacturer has come up with a new drug intended to provide greater headache relief than the old formula. Of 250 patients treated with the previous medication, 130 reported "fast relief from headache pain". Of 200 individuals treated with the new formula, 128 said they got "fast relief." At the 0.05 level, can we conclude that the new formula is better than the old? Using the appropriate statistical table, what is the approximate p-value for the test?

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Q: Source SS df MS Between treatments 33 F Within treatments Between subjects Error 3 Total 263

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Q: If the p-value is less than alpha in a one-tail test, what conclusion can you draw?

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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.