Answer:
a)
point estimate = 64.17
b)
formula is
where tc is the t critical value with c=80% and df= n-1 = 12 -1 = 11
tc = 1.363
( 62.48 , 65.85 )
$ 62.48 and $ 65.85
c)
no, restaurants claim is not reasonable
because, lower bound of confidence interval is greater than $ 59. hence $59 do not lie in our confidence interval.
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