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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 this a one or two tailed test and what is the correct equality for the alternative hypothesis statement?

Group of answer choices

One tailed, ≠

One tailed, =

One tailed, <

Two tailed, ≠

Two tailed, =

math   Statistics-And-Probability   
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TOPIC:Testing of hypothesis.

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