.  In the past, the average age of employees of a large corporation has been 40 years. Recently, the company has been hiring older individuals.  In order to determine whether there has been an increase in the average age of all the employees, a SRS of 25 employees was selected.  The average age in the sample was 42 years with a standard deviation of 5 years.    Assume population is normally distributed.  Let a = .05.

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.  In the past, the average age of employees of a large corporation has been 40 years. Recently, the company has been hiring older individuals.  In order to determine whether there has been an increase in the average age of all the employees, a SRS of 25 employees was selected.  The average age in the sample was 42 years with a standard deviation of 5 years.    Assume population is normally distributed.  Let a = .05.

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Step 1

Introduction:

The population standard deviation is not known. As a result, the sample standard deviation must be used to conduct the test. In this situation, it is most suitable to use the one-sample t-test, with a greater than-type alterna...

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