Business 20s first annual employment survey provided data sh

Business 2.0\'s first annual employment survey provided data showing the typical annual salary for 97 different jobs. The following data show the annual salaries for 30 different workers in computers, construction and engineering.

data is also available in the following Excel file:

Computers Construction Engineering

Job Salary Job Salary Job Salary

Data Mgr 94 Administrator 55 Aeronautical 75

Mfg. Mgr 90 Architect 53 Agricultural 70

Programmer 63 Architect Mgr. 77 Chemical 88

Project Mgr 84 Const Mgr. 60 Civil 77

Software Dev. 73 Foreperson 41 Electrical 89

Sr. Design 75 Interior Design 54 Mechanical 85

Staff Systems 94 Landscape Architect 51 Mining 96

Systems Analyst 77 Sr. Estimator 64 Nuclear 105

Use =0.05 to test for a significant difference among the mean annual salaries for the three job fields.

a. Compute the following ANOVA table (to 2 decimals, if necessary)

Factor ? ? ? ?

Error ? ? ?

Total ? ?

Solution

H0: All means are the same

Ha: atleast two means are difference

Prepare anova table

Alpha =0.05

p < alpha hence reject null hypothesis

All means are different.