Question

# Easter candy expenditure per consumer is normally distributed with a standard deviation of \$2.51. A candy...

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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