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 25 employees was selected. The average age in the sample was 42.5 years with a sample standard deviation of 5 years. Using a significance level of α = .01, do the sample data provide support for the contention that there has been a significant increase in the average age of all the employees? Do a complete and appropriate hypothesis test. Assume that the distribution of the population is normal. Step 1 (Hypotheses) H0: (Click to select) π n x-bar μ σ p s (Click to select) = ≠ ≤ > ≥ < HA: (Click to select) μ x-bar π p σ s n (Click to select) = ≠ ≤ > ≥ < Step 2 (Decision rule) Using only the appropriate statistical table in your textbook, the critical value for rejecting H0 is (Click to select) + - ± . (report your answer to 3 decimal places, using conventional rounding rules) Step 3 (Test statistic) Using the sample data, the calculated value of the test statistic is (Click to select) + - ± . (report your answer to 2 decimal places, using conventional rounding rules) Step 4 (Evaluate the null hypothesis) Should the null hypothesis be rejected? (Click to select) yes no Step 5 (Practical conclusion) Can you conclude that there has been a significant increase in the average age of all employees? (Click to select) yes no Using only the appropriate statistical table in your textbook, what is the most accurate statement you can make about the p-value of this hypothesis test? Answer: (Provide a brief one-sentence statement about the approximate p-value of this hypothesis test using the appropriate statistical table in your textbook)
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 25 employees was selected. The average age in the sample was 42.5 years with a sample standard deviation of 5 years. Using a significance level of α = .01, do the sample data provide support for the contention that there has been a significant increase in the average age of all the employees? Do a complete and appropriate hypothesis test. Assume that the distribution of the population is normal.
Step 1 (Hypotheses)
H0: (Click to select) π n x-bar μ σ p s (Click to select) = ≠ ≤ > ≥ <
HA: (Click to select) μ x-bar π p σ s n (Click to select) = ≠ ≤ > ≥ <
Step 2 (Decision rule)
Using only the appropriate statistical table in your textbook, the critical value for rejecting H0 is (Click to select) + - ± . (report your answer to 3 decimal places, using conventional rounding rules)
Step 3 (Test statistic)
Using the sample data, the calculated value of the test statistic is (Click to select) + - ± . (report your answer to 2 decimal places, using conventional rounding rules)
Step 4 (Evaluate the null hypothesis)
Should the null hypothesis be rejected? (Click to select) yes no
Step 5 (Practical conclusion)
Can you conclude that there has been a significant increase in the average age of all employees? (Click to select) yes no
Using only the appropriate statistical table in your textbook, what is the most accurate statement you can make about the p-value of this hypothesis test?
Answer: (Provide a brief one-sentence statement about the approximate p-value of this hypothesis test using the appropriate statistical table in your textbook)
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