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What is the value of the standard score for the sample population

What is the value of the standard score for the sample population? 

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Here is what I have so far

a.      What is the null hypothesis? H0: p ≤0.5

b.     What is the alternate hypothesis? Ha:p > 0.5

c.      What is the value of the standard score for the sample population? 0.84

Sample size: n= 39+32= 71

Proportion size:  = x/n = 39/71 = 0.549296 

And I am stuck, your help is appreciated!

 
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