Proctor & Gamble claims that at least half the bars of lvory soap they produce are 99.44% pure (or more pure) as advertised. Unilever, one of Proctor & Gamble's competitors, wishes to put this claim to the test. They sample the purity of 130 bars of Ivory soap. They find that 54 of them meet the 99.44% purity advertised. What type of test should be run? z-test of a proportion or t-test of a mean   The alternative hypothesis indicates a : a. right-tailed test b. left-tailed test c. two-tailed test Calculate the p-value.   Does Unilever have sufficient evidence to reject Proctor & Gamble's claim?        yes or no

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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.