Solution-Use a 05 significance level is this evidence that

Use a 05 significance level is this evidence that the

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Reference no: EM13578253

Twenty years ago, postal employees worked for the postal service an average of 7.5 years. Recently, a sample of 100 postal employees revealed that the average time these employees had worked for the postal service was (X‾) = 7 years. The population of employee lengths of service has a standard deviation = 5 years. Has decreased from the mean of 7.5 years of 20 years ago? Conduct a hypothesis test (use H0: µ =7.5). Use a .05 significance level. Is this evidence that the average length of employment with the postal service has decreased from twenty years ago?

Reference no: EM13578253

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Use a 05 significance level is this evidence that the

Reference no: EM13578253

Reference no: EM13578253

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