Homework Answers
H0: p = 0.9
Ha: p 
0.9 850
Sample proportion 
= 850 / 1000 = 0.850
Test statistics
z =(
- p) / sqrt(p(1-p))/ n
= (0.850 - 0.9) / sqrt(0.9 * 0.1/ 10000)
= -5.27
p-value = 2 * P(Z < z)
= 2 * P(Z < -5.27)
= 2 * 0.0
= 0.0000
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