HPS201/HPS771 Research Methods In Psychology A - Assignment 2

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Question 5

A new therapy based on Cognitive Behavioral Therapy theory has been developed to treat Stress. As a Clinical Psychologist, you are interested in the efficacy of this new therapy and become aware of two studies that have been conducted.

  • Study A investigated the impact of this new therapy on Stress in Young Adults (age 18-25 years). They compared the Stress levels of a group of 150 young adults who received the new therapy to a group of 150 young adults who were receiving no therapy. Stress levels were measured using the ‘Stress Rating Scale’, with scores ranging from 0-50 (higher scores = higher levels of stress).
  • Study B investigated the impact of this new therapy on Stress in Older Adults (age 40-60 years). They compared the Stress levels of a group of 150 older adults who received the new therapy to a group of 150 older adults who were receiving no therapy. As per Study A, stress levels were measured using the ‘Stress Rating Scale’, with scores ranging from 0-50 (higher scores = higher levels of stress).

 

The research teams of these respective studies send you their preliminary analyses, with both studies conducting an independent samples t-test to compare the mean stress level of those who received the new Stress therapy to those who were not receiving any therapy in their respective studies. You receive the following SPSS output:

Based on your understanding of the steps involved in conducting and interpreting an independent samples t-test (as discussed during the Blackboard Collaborate), would you argue that the Stress therapy in question is effective? If no, why not? If yes, would you be more, less or equally likely to use this new therapy with Young or Older adults? Justify your responses using relevant statistical information. (2 marks).

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