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What does a graph with no trend show about the variables?
that they will not be correct
When is there no trend line for a scatter plot?
When no possible relationship between the two variables in question is statistically significant.
What does no trend mean?
Usually the expression is employed in the context of the relationship between a dependent variable and another variable. The latter may or may not be independent: often it is time but that is not necessary. In some cases there is some indication that that there is a linear relationship between the two variables and that relationship is referred to as a trend.Note that a trend is not the same as causation. There may appear to be a strong linear trend between two variables but the variables may not be directly related at all: they may both be related to a third variable. Also, the absence of linear trends does not imply that the variables are unrelated: there may be non-linear relationships.
What does it mean when something is directly proportional?
Directly proportional means that both variables increase or decrease at the same time.
Can variables be positive or negative?
both, variables can be anything
