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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 sample of 64 employees was selected. The average age in the sample was 45 years with a standard deviation of 16 years. Let α = 0.5.
a. State the null and the alternative hypothesis.
b. Compute the test statistic.
c. Using the critical-value approach, test to determine wether or not the mean age of all employees is significantly more than 40 years.
a.) What is the standard error of the mean? (round to two decimal places as needed)b.) How would the standard error change if the sample size was 5 instead of 20 with the same sample standard deviation? Select the correct choice below and fill in any..
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Your write-up of this experiment should include your work to determine the n, your methodology, your record of the experiment, your confidence interval, your interpretation of the confidence interval, your formal hypothesis test and your comments ..
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