You are a researcher interested in addressing the question: does smiling cause mood to rise (i.e. become more positive)? Sketch between-participants, within-participants, and matched-participants designs that address this question and discuss the advantages and disadvantages of each to yielding data that help you answer the question. Describe and discuss each design in 4-5 sentences.

First, name your methods of data collection.

Then, make a list of questions for the data collecting.

Next, make sure your samples gathered are random. How will you guarantee that?