Ans:
a)
n=10
sample mean=78
standard deviation=15.205
b)
c)
Test statistic:
t=(78-84.3)/(15.205/sqrt(10))
t=-1.310
df=10-1=9
p-value=tdist(1.310,9,1)=0.1113
As,p-value>0.1,we fail to reject the null hypothesis.
There is not sufficient evidence to conclude that waiting time is decreased(i.e. new system is effective)
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