Homework Answers
H0: P= 0.2
HA: P<0.2
Since it is left tailed test critical value of Z= -1.645
Rejection region for left tailed test is
Z<-1.645
Standardized Z statistic is
Z=p-P/sqrt(PQ/n)
Z= 0.168-0.2/sqrt(0.2*0.8/250)
Z= -0.032/sqrt(0.00064)
Z= -0.032/0.0253
Z=-1.26
Since Calculated value of Z is greater than critical value of Z for left tailed test, we fail to reject NULL HYPOTHESIS H0 at 0.05 level of significance.
Fail to reject H0. There is no enough evidence to support the reserachres's claim.
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