The Bank of america trends in Consumer Mobility Report indicates that in a typical day,51% of users of mobile phones use their phone at least once per hour, 26% use their phonea few times per day, 8% use their phone morning and evening, and 13% hardly ever usetheir phones. The remaining 2% indicated that they did not know how often they usedtheir mobile phone (USa today, July 7, 2014). Consider a sample of 150 mobile phoneusers.a. what is the probability that at least 70 use their phone at least once per hour?

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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.