Create a PowerPoint presentation to teach students about internal and external validity.  The presentation is to be usable in a teaching environment. Include the following:  

• Overview introduction on why researchers should be aware of internal and external validity.
• Internal Validity

1. Define internal validity.
2. Identify four common threats to internal validity
3. Provide an example for each of the four selected threats to internal validity using your intended dissertation research or quantitative example for this course.
4. Discuss two plausible research strategies that may be used to mitigate two of the selected threats to internal validity.

• External Validity

1. Define external validity.
2. Identify two common threats to external validity.
3. Provide an example for each of the two selected threats to external validity using your intended dissertation research or quantitative example from this course.
4. Discuss one plausible research strategy that may be used to mitigate one of the selected threats to external validity.

• Provide a presentation conclusion. 

Length: 8 to 10 slide PowerPoint  presentation. Speaker notes (minimum 200 words per slide)