A study was conducted on the use of cell phones for accessing news. The study reported tha 47% of users under age 50 accessed news on their cell phones (population 1) and 15% of users age 50 and over accessed news on their cell phones (population 2). Suppose that the survey consisted of 1,000 users under age 50, of whom 470 accessed news on their cell phones, and 640 users age 50 and over, of whom 185 accessed news on their cell phones. At 0.05 level of significance, if we want to test whether the proportion of users under the age 50 who access news on their cell phones are more than the proportion of users age 50 and above who access news on their cell phones. Then, the test statistic is:

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