More hypotheses For each of the following, write outthe alternative hypothesis, being sure to indicate whetherit is one-sided or two-sided. a) Consumer Reports discovered that 20% of a cer-tain computer model had warranty problems over the first three months. From a random sample, the manufacturer wants to know if a new model hasimproved that rate. b) The last time a philanthropic agency requested dona-tions, 4.75% of people responded. From a recent pilot mailing, they wonder if that rate has increased.c) A student wants to know if other students on hercampus prefer Coke or Pepsi.

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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.