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Journal Article 1: Giner-Sorolla, R., & Chapman, H. A. (2017). Beyond purity: Moral disgust toward bad character. Psychological Science, 28, 80–91. doi:10.1177/0956797616673193

Learning Objectives: 7-1: How to compare a sample to a known population value when you have interval or ratio data using the one-sample t test. | 7-2: How to compute an effect size when comparing a sample to a known population.

Summary: This is a report of multiple studies on the response of disgust versus anger. The authors use a one-sample t test in Study 1. Note that the authors submitted corrections to the article.

Questions to Consider:

1. In Study 1, how did the researchers use the one-sample t test?
2. In Study 1, what effect size did the authors report?
3. What were the results of Study 1, and how did the other studies in this article build on these results?

Journal Article 2: Giner-Sorolla, R., & Chapman, H. A. (2017). Corrigendum: Beyond purity: Moral disgust toward bad character. Psychological Science. Advance online publication. doi:10.1177/0956797617736343

Learning Objectives: 7-1: How to compare a sample to a known population value when you have interval or ratio data using the one-sample t test. | 7-2: How to compute an effect size when comparing a sample to a known population.

Summary: This is the correction to Article 1.

Questions to Consider:

1. Did the corrections change the interpretation of statistical significance?
2. Did the corrections change the interpretation of the effect sizes?
3. Why do you think it was important for the authors to submit these corrections?

Journal Article 3: Lopata, C., Hamm, E. M., Volker, M. A., Sowinski, J. E., Thomeer, M. L. (2007). Motor and visuomotor skills of children with Asperger’s disorder: Preliminary findings. Perceptual and Motor Skills, 104, 1183–1192. doi:10.2466/pms.104.4.1183-1192

Learning Objectives: 7-1: How to compare a sample to a known population value when you have interval or ratio data using the one-sample t test. | 7-2: How to compute an effect size when comparing a sample to a known population.

Summary: This is a study examining the motor skills of a sample of 6 to 13-year old boys diagnosed with Asperger’s Syndrome (which the DSM-5 now classifies as Autism Spectrum Disorder). The authors compared their sample’s scores on standardized tests to population scores.

Questions to Consider:

1. What inferential statistic did the authors use to compare their sample scores to the population?
2. What effect size did the authors report?
3. What were the results and implications of the study?