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2026-02-23 17:24:59.1771867499
What is the observed value of the test statistic?
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The test statistic is $$\frac{\hat{p}-p_0}{\sqrt{\dfrac{\hat{p}(1-\hat{p})}{n}}}\sim N(0,1).$$ Plug your values $\hat{p}=30/191$, $p_0=0.1$, $n=191$ and get the observed value of the test statistic.