Jayden's investigation is a comparative study, as he is examining the differences in muscle gains between two different protein shake brands consumed by him and his friend. To enhance the design, Jayden could include a larger sample size by involving more participants and possibly adding a control group that doesn't consume any protein shakes. Additionally, ensuring that both individuals follow the same diet and exercise routine outside of the protein shakes would help to isolate the effects of the shakes more accurately. For his results to contribute to scientific knowledge, they should be published in a peer-reviewed journal and repeated by other researchers to validate the findings.
5. Jayden sets up an investigation to see how different protein shakes can impact muscle gains. He purchases two different brands of protein shakes. He drinks one brand and his friend drinks the other brand. They each perform the same exercises every day for one month. Jayden compares their muscle composition before and after the month of workouts. Evaluate Jayden’s experimental design. What type of investigation has Jayden planned: descriptive, comparative, or experimental? How could the design of Jayden’s investigation be improved? What needs to happen so that his results can become a part of the body of scientific knowledge?
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