When graphing sample means,nonparallel lines may indicate the existence of an interaction,or may indicate sampling error.

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Nonparallel lines may indicate the existence of an interaction between variables, but they can also indicate sampling error. Therefore, it is important to conduct statistical tests to determine if the difference in the sample means is statistically significant and if there is evidence of an interaction effect.

When Graphing Sample Means,nonparallel Lines May Indicate the Existence of an Interaction,or