Easter candy expenditure per consumer is normally distributed with a standard deviation of $2.51. A candy manufacturer claims that the average Easter candy expenditure per consumer is no more than $20. Fifteen consumers were randomly selected. The average Easter candy expenditure per consumer was found to be $21.22 with a standard deviation of $3.00. Can you reject the candy manufacturer's claim at α=.05?
What is the 99% confidence interval for the true average Easter candy expenditure per consumer (in $)?
a. 
None of the answers is correct 

b. 
(19.5512, 22.8888) 

c. 
(18.9140, 23.5260) 

d. 
(19.9498, 22.4902) 

e. 
(20.1539, 22.2861) 
We have given that,
Sample mean =$21.22
Population standard deviation=$2.51
Sample size=15
Level of significance =0.01
Z critical value (by using Z table)=2.576
Confidence interval formula is
=(19.551,22.889)
b. 
(19.5512, 22.8888) 
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