Ans:
sample standard deviation,s=8.159
n=8
df=8-1=7
Critical Chi square values:
CHIINV(0.005,7)=20.278
CHIINV(0.995,7)=0.989
Lower limit=sqrt((8-1)*8.159^2/20.278)=4.79
Upper limit=sqrt((8-1)*8.159^2/0.989)=21.70
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