What potential threats to internal validity do you see that your colleague has not identified?

Problems in Designing an Experimental Research Study
Prior to beginning work on this discussion, please read the required articles by Skidmore (2008) and Henrich, Heine, & Norenzayan (2010). Carefully review the PSY635 Week Two Discussion Scenario. Apply the scientific method to the information included within the scenario and develop a null and a research hypothesis based on it. Using the hypotheses you have developed, compare the characteristics of the different experimental research designs discussed in the Skidmore (2008) article and choose the one that is most appropriate to adequately test your hypotheses. Identify potential internal threats to validity and explain how you might mitigate these threats. Apply ethical principles to the proposed research and describe the implications of this type of research in terms of the population(s) and cultural consideration(s) represented in the sample(s) within the scenario.
Guided Response: Review several of your colleagues’ posts and respond to at least two of your peers by 11:59 p.m. on Day 7 of the week. You are encouraged to post your required replies earlier in the week to promote more meaningful interactive discourse in this discussion.
After reading your colleague’s null and research hypotheses, do you feel that these accurately respond to the scenario? Please provide a rationale for your agreement or disagreement. Evaluate your colleague’s proposed research design and explain whether or not you agree with the research design chosen providing a brief rationale for your opinion citing the resources as necessary. What potential threats to internal validity do you see that your colleague has not identified? Consider the ethical implications your colleague has described and identify any other potential threats to external validity your colleague has not mentioned. Recommend potential solutions to the areas of both internal and external validity in the research design proposed by your colleague.
 
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