I need to design an experiment with an independent variable and 2 levels. I would like to experiment with whether people say something when someone removes an object from a bag. So far I have

Independent Variable -Removal of Object from bag

1st level-removal of significant vs. insignificant object

I need a second level, it should be something that may have an interaction with the 1st level.
I've thought of gender-but not sure if that's really a good level. Any other ideas or thoughts would be appreciated.
Thanks

Gender or status could be other independent variables. However, if you use gender, you would have four conditions, male observer - male remover; male - female; female - male; and female - female.

Is the bag a possession of the observer or not?

the bag would be a dummy bag, possession of someone conducting the experiment

When designing an experiment with an independent variable and multiple levels, it is important to consider factors that can potentially interact with each other. In the context of your experiment on whether people say something when an object is removed from a bag, here's a suggestion for a second level that could interact with the first level:

Second level - Presence or absence of a bystander

By including the presence or absence of a bystander as the second level, you can examine whether the significance of the removed object (first level) and the presence of a bystander (second level) have an interaction effect on whether people say something.

To conduct the experiment, you can follow these steps:

1. Create a scenario: Set up a controlled environment where participants observe someone removing an object from a bag. Ensure that the scenario is consistent across all participants.

2. Randomly assign participants: Randomly assign participants to different conditions, ensuring an equal number of participants in each level of both the first and second variables. For example, half of the participants witness the removal of a significant object with a bystander present, while the other half witness the removal of an insignificant object with no bystander present.

3. Observe and record responses: Have observers note whether participants verbalize something in response to the object removal. This can be done using a standardized coding system or by collecting qualitative observations.

4. Analyze and interpret results: Use statistical analysis techniques (such as chi-square test or logistic regression) to explore the relationships between the two independent variables and participants' responses. This analysis will help determine if there is a significant interaction effect between the significance of the removed object and the presence of a bystander on whether people say something.

By considering the presence or absence of a bystander as a second level, you can investigate how different combinations of the first and second levels influence participants' behavior and potentially uncover any interaction effects. Remember to ensure your study has ethical considerations in place and obtain informed consent from participants.