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A simple random sample of 100 postal employees is used to test if the average time...

A simple random sample of 100 postal employees is used to test if the average time postal employees have worked for the postal service has changed from the value of 7.5 years, as recorded 20 years ago. The sample of the current employees gave a mean service time 7.9 years with a standard deviation of s = 2 years. Assume the distribution of the time the employees work in service jobs is approximately normal.

What is the alternative hypothesis statement?

Group of answer choices

HA: µ > 7.5

HA: µ ≠ 7.5

HA: s < 2

HA: s> 2

HA: µ = 7.5

Math   Statistics-And-Probability   
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