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A survey of 144 retail stores revealed that the average price of a DVD was $375 with a standard error of $20. Reference:

A survey of 144 retail stores revealed that the average price of a DVD was $375 with a standard error of $20.
Reference: Ref. 9-4


What is the 95% confidence interval to estimate the true cost of the DVD?


a. $323.40 to $426.60
b. $328.40 to $421.60
c. $335.00 to $415.00
d. $335.80 to $414.20

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