I know that these laboratory analysis reports each have a linear regression relationship and two have a positive slope and one has a negative slope. I am taking my first statistics class and want to be able to explain these very well in a research poster I am doing for work. Am I missing any important information? The negative slope indicates that the values are decreasing together negatively. The positive means they are increasing together. The ADL concentration chart does not have a very good relation but there is still a relation.