When evaluating graphic displays what do the terms level trend and variability mean?

Apply Aristotle’s ideas to the argument
July 13, 2020
Comparing the use of the four and five-factor model
July 13, 2020

When evaluating graphic displays what do the terms level trend and variability mean?

Minimum of 350 words including references from :Cooper J. O. Heron T. E. & Heward &. W.
(2007).Applied Behavior Analysis(2nd ed.). Pearson Education Inc.
Miltenberger R. G. (2016).Behavior Modification: Principles and Procedures(6th ed.). Cengage Learning.
Research designs
Part 1: Select one of the following research designs: ABAB Reversal Design; Multiple Baseline Design; Alternating Treatments Design; or Changing Criterion Design. Provide a brief overview of your selected research design and discuss types of situations in which the design would work best and those situations in which the design would not work.
Part 2: When evaluating graphic displays what do the terms level trend and variability mean? How do these terms relate to the use of visual analysis to determine the effectiveness of an intervention?