Which of the following represents the line of no effect in statistical analysis?

In statistical analysis, the line of no effect is typically represented by a vertical line. This line serves as a critical reference point in various types of data visualizations, such as forest plots or confidence interval graphs. It indicates the value at which there is no difference or no effect observed. For example, in a study comparing two groups, if the vertical line represents the value of zero, it signifies that there is no significant difference between the groups being compared.

The reason a vertical line is used is that it effectively separates the regions where results are statistically significant from those where they are not. Results to the right of the line may indicate a positive effect, while those to the left may show a negative effect, providing clear visual cues about the impact or effectiveness being measured. This makes it easier for researchers and readers to interpret the findings of the analysis.