Answer:
z ≈ -0.92
Step-by-step explanation:
Put the numbers in place of the corresponding variables and do the arithmetic.
[tex]z=\dfrac{\hat{p}-p}{\sqrt{\dfrac{pq}{n}}}=\dfrac{\dfrac{495}{1708}-0.30}{\sqrt{\dfrac{0.30(1-0.30)}{1708}}}=\dfrac{495-0.30(1708)}{\sqrt{1708(0.30)(0.70)}}=\dfrac{-17.4}{\sqrt{358.68}}\\\\\boxed{z\approx -0.92}[/tex]
