Homework Answers
Ans:
sample size,n=69
sample mean=38
sample variance=255
df=69-1=68
critical t value(two tailed)=tinv(0.05,68)=1.9955
Margin of error=1.9955*sqrt(255/69)=3.8361
left end=38-3.8361=34.1639
right end=38+3.8361=41.8361
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