Question 1076740
Ho:p<=0.8
Ha: p>0.8, one way test
assume random sample, equal probability for each choice (independence).
alpha=0.01 P{reject Ho:Ho is true}
test statistic is one sample proportion
critical value z>2.326

z=(0.9-0.8)/sqrt (0.8*0.2/100); sqrt of 0.0016=.04
z=(0.1/.04)=2.5
probability z> 2.5 is 0.0062
check with one sample proportion test on calculator, z=2.5
Reject Ho
p-value given is 0.0062.