## anonymous one year ago Help solving Find the critical value z a/2 that corresponds to a=0.09

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1. amoodarya

I think your question is not clear !

2. anonymous

no its exactly how its written on my homework problem @amoodarya

3. anonymous

|dw:1436666681529:dw|

4. anonymous

so you want to find the Z value such that $$P(|Z|>z_{\alpha/2})=\alpha$$; the equivalent one-tailed probability is just half of that: $$P(Z>z_{\alpha/2})=\alpha/2$$ so you can look at the cdf $$P(Z<z_{\alpha/2})=1-\alpha/2$$ and apply an inverse Z cdf (or equivalently look up the $$z_{\alpha/2}$$ corresponding to an area of $$1-\alpha/2$$ in your Z table)

5. anonymous