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?b. what is the probability that at least 75 but less than 80 use their phone at least onceper 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.