Describe one threat to the validity of the fun “grey hair” study shown in the video; this can be a threat to the internal or external validity, or both.

This discussion board activity is about the fun “grey hair” example. (Note: if you have not done so already, please go over the Fun “Grey Hair” Example of Experimental Research before posting in this discussion board.)
For this discussion, include all of the following in your post:
Describe one threat to the validity of the fun “grey hair” study shown in the video; this can be a threat to the internal or external validity, or both. The threat you describe in your post must not be about the confounding variable that has been pointed out in the video (i.e., the “model” in the pictures were dressed differently).
What do you think is a strength of the fun “grey hair” study shown in the video?
HERE IS THE VIDEO:

Episode 45: Basic Research Design – Part 1

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