A researcher is trying to decide whether or not to add another variable to his model. He has estimated the following model from a sample of 28 observations. 
SSE = 1,425
SSR = 1,326
He has also estimated the model with an additional variable X3. The results are 
SSE = 1,300
SSR = 1,451
What advice would you give this researcher? Use a .05 level of significance.
Definitions:
Reward Power
Reward power is the ability of an individual to influence others' actions by controlling access to desired resources or rewards.
Visionary Leadership
Characterizes leaders who have a clear, inspiring vision for the future of their organization and the ability to motivate others to work towards achieving it.
Effective Leadership
The ability of an individual to inspire, influence, and guide others toward achieving collective goals.
Present State
The current condition or situation of a system, process, or entity at a specific point in time.
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