Question Details

State the null and the alternative hypotheses 



1.	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  = .05.

a.	State the null and the alternative hypotheses.
b.	Compute the test statistic.
c.	Using the p-value approach, test to determine whether or not the mean age of all employees is significantly more than 40 years.



2.	The average gasoline price of one of the major oil companies has been $2.20 per gallon. Because of cost reduction measures, it is believed that there has been a significant reduction in the average price. In order to test this belief, we randomly selected a sample of 36 of the company's gas stations and determined that the average price for the stations in the sample was $2.14. Assume that the standard deviation of the population () is $0.12.

a.	State the null and the alternative hypotheses .
b.	Compute the test statistic.
c.	What is the p-value associated with the above sample results?
d.	At 95% confidence, test the company's claim.





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