The following diagram shows two budget lines: A and B. 
Which of the following could explain the change in the budget line from A to B?
Definitions:
Error Variance
Refers to the variation in a set of scores that is caused by extraneous variables or random error, not by the variables under investigation.
Order Effects
The impact that the sequence of presenting stimuli or conditions can have on the outcome of a study.
Statistical Validity
The extent to which the statistical conclusions drawn from a study are accurate and reliable.
Scale Construction
The process of developing a tool or instrument for measuring variables, typically involving item generation and validation.
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