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A manager is interested in the amount of time employees spend each day playing video games at work. The manager takes a random sample of 18 employees who showed a mean time of 55 minutes per day with a standard deviation of 5 minutes. Assuming that these times follow a normal distribution, compute a 90% confidence interval for the average amount of time employees spend playing video games each day at work.
Select one:
a. [52.39, 57.61]
b. [53.34, 56.66]
c. [52.95, 57.05]
d. [52.46, 57.54]
e. [52.82, 57.18]
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