An experiment was conducted to investigate the effect of general hospital experience on the attitudes of physicians toward the lower-income group. A random sample of 50 physicians who had just completed 4 weeks of service in a general hospital were categorized according to their concern for lower-income group before and after their general hospital experience. The data are shown in the table. Do the data provide sufficient evidence to indicate a change in "concern" after the general hospital experience? If so, describe the nature of the change. 
Definitions:
Philosophy Course
An academic class focused on the study of fundamental questions about existence, knowledge, values, reason, mind, and language.
Expectancy-Value Model
A psychological theory that explains motivation by combining individual expectations of success with the value of the success.
Probability of Success
A statistical measure that calculates the likelihood of a desired outcome or successful result happening.
Incentive Value
The attractiveness or appeal of a goal or reward that motivates behavior.
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