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week 8.1 Discussion responses

week 8.1 Discussion responses

Author: david utsey

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Please write a response to each discussion.

Sperry 8.1

                 As researchers prepare for their study they must determine what the null hypothesis is. The null hypothesis is either excluded or retained with statistics, and often the opposite of what the researcher believes is true (Erford, 2015). For example, if teens participated in computer-based cognitive therapy (cCBT) to treat depression. The null hypothesis would be that cCBT would not be a primary choice of therapy for teens; as they see no added value when compared to face-to-face therapy.

                The researchers need to address the alternative hypothesis. Alternative hypothesis is the research hypothesis and states what will occur if the null hypothesis is rejected (Eford, 2015). For example, teens who participate in cCBT will find value and continue with treatment, leading to a decrease in depression and anxiety.

                There are two other items that must be addressed within research, statistical and practical significance. Statistical significance is the unlikelihood that the mean differences observed in the sample have occurred due to sampling error (Matheson, Unknown). In the example of cCBT the test was statistically significant between all age groups (Ebert, 2015).

                Practical significance looks at whether the difference is large enough to be of value in a practical sense (Matheson, Unknown). In this example the study showed practical significance. The p-value for the subcategories ranged from .007 to .97 (Ebert, 2015).

Medeiros 8.1

Eighty participants (40 males, 40 females; aged 18-25 years), who were a mixture of students and non-students, were recruited using opportunity sampling. They were recruited using social media, and from psychology classes. All participants were aged between 18- 25 years to reduce the impact of age related differences acting as a potential extraneous variable in the eyewitness memory task (Karpel et al., 2001).

Design A correlational design was used, with the co-variables being: the personality traits derived from the Big 5 models (MacRae & Costa, 1997) and selected from the International Personality Item Pool (2013), e.g. Extraversion, Openness, Agreeableness, Conscientiousness, Neuroticism, and the sub-trait of Neuroticism, Anxiety; and measures of accuracy in an eyewitness memory task, i.e., correct and false recognition scores. Additionally, two multiple regressions were conducted. In these multiple regressions, the personality traits were run as predictor variables, and the recognition scores (both true and false) were conducted as criterion variables.

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