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Test statistic in a two-sample z test for the difference of proportions

AP.STATS: VAR‑6 (EU), VAR‑6.K (LO), VAR‑6.K.1 (EK)
You might need: Calculator

Problem

Market researchers wondered if teens were more or less likely than adults to use their mobile phone as an alarm clock. The researchers surveyed a random sample of people and removed those who didn't have a mobile phone. Here are the results:
Use phone as alarm?TeensAdults
Yes70150
No30150
Total100300
The researchers want to test if these results suggest a significant difference between the proportions of teens and adults that use their phone as an alarm clock. Assume that all conditions have been met.
Which of the following would be an appropriate test statistic for their test?
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