Validity Threats

Correct Answer: Internal validity threat due to differences in task prioritization

In this given scenario, the most likely threat is an 'Internal validity threat due to differences in task prioritization.' This type of threat comes about when the prioritization of tasks isn't aligned with the client's needs. Instead of focusing on what the client wants, the team prioritized based on the perceived complexity of tasks which could lead to delivering less relevant features early in the project while the most needed ones are left behind. This inconsistency directly influences the internal validity of the project. Now, why other choices are wrong: 'Construct validity threat due to non-involvement of stakeholders' is not the case here as the stakeholders are involved but their needs are not being prioritized correctly. 'External validity threat due to task complexity' is not accurate since the external validity has more to do with the generalization of the results, not the complexity of the tasks. Lastly, 'Selection bias due to choosing easier tasks first' is incorrect because the scenario states that the tasks were prioritized based on 'perceived complexity', not necessarily that the easier ones were chosen first.

Correct Answer: The project schedule might be affected.

The scenario describes a delay in the delivery of a component which will be integrated into your product. This could directly impact the schedule of the project as tasks that depend on this component would not proceed as planned, making 'The project schedule might be affected.' the appropriate answer. The other options mention budget overrun, stakeholders rejecting product, or demotion of team, none of which is directly related to the delay by the other team. So these answers are not correct in this context.

Correct Answer: Internal Validity Threat

The situation posed in the question represents an Internal Validity Threat. This is because how the software has been built (not originally designed to be upgradable while still in use) is what's causing the problem or issue for the Agile team. So, this is an internal issue related to the experiment (the software upgrade) itself. External Validity Threat would be the answer if the issue was due to factors outside the software environment such as customer behavior or market trends, which is not the case here. Measurement Validity Threat deals with the appropriateness, meaningfulness and usefulness of the inferences made by the research team, which is not the subject matter of the posed question. Finally, Statistical Validity Threat is when the issue is centered around the statistical conclusions drawn from the experiment, the scenario presented doesn't involve statistical data interpretation.