Consider the transportation problem in the data set and optimal solution below.
Calculate improvement indices on each empty cell. Is this solution optimal? 
Definitions:
Longitudinal
A type of research study in which data is gathered from the same subjects repeatedly over a period of time.
Experimental
Pertaining to a methodological approach in research that involves manipulation of variables to determine cause-and-effect relationships.
Cross-Sectional
A research design that analyzes data from a population, or a representative subset, at a specific point in time.
Concrete Operations
A stage in Piaget's theory of cognitive development, typically occurring between ages 7 and 11, where children gain the ability to think logically about concrete events.
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