Essay on Homework 1

735 WordsApr 18, 20143 Pages
Homework #1 Please answer the questions below. Each response should be in paragraph form. When done please submit your assignment to the Canvas drop box. 1. Describe how the scientific method differs from other ways of knowing. Scientific method utilizes a series of facts, hypotheses, laws, and the theories to explain observations in the natural world. It involves observing, coming up with a hypothesis and make predictions, test those predictions and repeat to find the similar results. 2. Describe the threats to internal validity discussed in the text: history, maturation, testing, instrument decay, regression toward the mean, and selection differences. History is a treat to internal validity for the one group design due to…show more content…
5. Give 2 possible drawbacks to a within subjects design. Two possible drawbacks to a within subjects design are learning/testing effect and order effect. Learning effect occurs when the participant is exposed to a test multiple times. The second time the participant can do better because he/she has pervious knowledge about the test already. Order effect is when the order of presenting the treatments affects the dependent variable. 6. Give 2 possible drawbacks to a between subjects design. Two possible drawbacks to a between subjects design are assignment bias and practicality. Assignment bias occurs when the researchers fail to take into account the differences between the two groups, such as SES. Practicality is a draw back because this design requires researchers to test more participants since each group was only measured once and they need to a new group for every treatment and manipulation. 7. Describe a study in which you may have to employ a counterbalancing scheme. A study in which you may have to employ a counterbalancing scheme is determining the effect of loss of sleep on the physical strength. The independent variable will be the differences in the amount of time participants spent sleeping the night before they do the test run and the dependent variable is the time take to run

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