What does data analysis emphasize?
a. Graphic displays of data separately for each individual which made it easy to evaluate any modifications as distinct phases in a quasi experimental style
b. Statistical displays of group data which made it easy to evaluate any modifications as distinct phases in an experimental style
c. Methods used by investigators in basic and applied behavior analysis research and the routine delivery of practical services.
d. Graphic displays of data for groups of individuals which made it easy to evaluate any modifications as distinct phases in a quasi experimental style