SXE company has a service standard of 4.0 hours or less. During one week, a sample...
SXE company has a service standard of 4.0 hours or less. During one week, a sample of 20 calls resulted in a sample mean of 5.0 hours with a sample standard deviation of .5. Can we conclude, statistically, that the mean service time met the service standard?
Assume alpha=.05
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