Exercise 13 & 14 (total 20 questions) – reliability and validity –

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Sample Problem/Case Description : (Complete details of 20 problems in attached two word files)

 

EXERCISE 13 Questions:

 

Relevant Study Results

“Psychological well-being was assessed with 4 self-report scales. (1) The State-Trait Anxiety Inventory is a 40-item measure of both immediate and longer-standing symptoms of anxiety. … Calculation of reliability with the study sample indicated a coefficient alpha of .93. (2) The Center for Epidemiological Studies–Depression Scale is a 20-item measure developed for evaluating depressive symptoms in community-residing older adults. Calculation of reliability with the study sample indicated a coefficient alpha of .89. (3) The Bradburn Affect-Balance Scale is a 10-item scale developed for use with older adults and assesses both positive and negative emotions. Calculation of reliability with the study sample indicated a coefficient alpha of .72. (4) Stress was measured by a self-report scale … Calculation of reliability with the study sample indicated a coefficient alpha of .76” (Ashmore et al., 2005, pp. 272–3).

For Questions 1 through 5, please refer to the Relevant Study Results for Research Article 2.

1. Based on the information provided from the Ashmore et al. (2005) study, which scale has the strongest reliability? Provide a rationale for your answer.

2. Based on the information provided from the Ashmore et al. (2005) study, which scale has the weakest reliability? Provide a rationale for your answer.

3. What type of reliability is provided for the four scales used in the Ashmore et al. (2005) study? Provide a rationale for your answer.

4. Are four scales used in the Ashmore et al. (2005) study examined for validity? Provide a rationale for your answer.

 

5. Are four scales in the Ashmore et al. (2005) study reliable in this study? Provide a rationale for your answer.

 

EXERCISE 14 Questions

 

RESEARCH ARTICLE 3

 

Source: Champion, V., Skinner, C. S., & Menon, U. (2005). Development of a self-efficacy scale for mammography. Research in Nursing & Health, 28 (4), 329–36.

 

Relevant Study Results

Champion et al. (2005) developed a self-efficacy scale for mammography. “A Cronbach alpha correlation coefficient of .87 was obtained for the total self-efficacy scale” (Champion et al., 2005, p. 332). Confirmatory factor analysis was conducted on the self-efficacy scale data to determine the theoretical structure of the scale. In addition, the self-efficacy scale was given to subjects to predict the likelihood of women getting a mammogram.

 

For Questions 8 through 10, please refer to the excerpt from Research Article 3.

 

 

8. Using the self-efficacy scale to predict the likelihood of women getting a mammogram is an example of what type of construct validity? Provide a rationale for your answer.

 

 

9. Why was confirmatory factor analysis done in this study?

 

 

10. Discuss the reliability and validity of the self-efficacy scale. Would you recommend the use of this scale to measure self-efficacy for mammography in your patients?

 

 

 

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