One way ANOVA using JASP

Summary

This video presents the results of a one-way ANOVA examining the relationship between physical activity levels and coping with workplace stress. The analysis shows that individuals in moderate and high physical activity groups have significantly higher coping scores than those in sedentary groups. The findings suggest that physical activity positively impacts stress management, with a large effect size indicated by η² = 0.480. The video also includes an explanation of assumptions, statistical tests, and how to report the results in APA style, offering valuable insights for those interested in research methodology and data interpretation.

Takeaways

• 😀 A one-way ANOVA was conducted to examine if coping with workplace stress scores differ across physical activity levels.
• 😀 The four physical activity groups in the study were sedentary, low, moderate, and high levels of physical activity.
• 😀 Assumptions for the one-way ANOVA were met, including normal distribution and homogeneity of variances.
• 😀 Significant differences were found between the sedentary group and both the moderate and high physical activity groups.
• 😀 The moderate group had a significantly higher coping with workplace stress score compared to the sedentary group, with a p-value of 0.002.
• 😀 The high physical activity group also showed a significantly higher coping score than the sedentary group, with a p-value of less than 0.001.
• 😀 No significant differences were observed between other group pairs (e.g., low vs. high, low vs. moderate).
• 😀 Post-hoc tests confirmed that moderate and high activity groups had higher coping with workplace stress scores than the sedentary group.
• 😀 The effect size for the one-way ANOVA was large, with an eta-squared of 0.480, indicating a meaningful difference between groups.
• 😀 The report presented the results in APA style, detailing assumptions checks, F-values, p-values, and the interpretation of group differences.

Q & A

What was the purpose of conducting a one-way ANOVA in this study?

The one-way ANOVA was conducted to determine if coping with workplace stress scores differed across groups with different levels of physical activity (sedentary, low, moderate, and high).

What were the groups compared in the study?

The groups compared in the study were sedentary, low, moderate, and high levels of physical activity.

What did the asterisk (*) in the table signify?

The asterisk (*) in the table indicated significant differences between the compared groups, based on the p-values from the statistical tests.

What does a negative mean difference between groups indicate?

A negative mean difference indicates that the first group (e.g., sedentary) had a lower coping with workplace stress score compared to the second group (e.g., moderate or high physical activity).

Why were only the comparisons between sedentary vs. moderate and sedentary vs. high groups significant?

These comparisons were significant because their p-values were less than the threshold of 0.05, showing that the coping with workplace stress scores were significantly different between these specific groups.

What does a p-value less than 0.05 indicate?

A p-value less than 0.05 indicates that the results are statistically significant, meaning that the observed differences between the groups are unlikely to have occurred by chance.

What were the results of the post-hoc tests?

The post-hoc tests revealed that individuals in the moderate and high physical activity groups had significantly higher coping with workplace stress scores compared to those in the sedentary group.

What does the eta squared (η²) value of 0.480 indicate?

An eta squared (η²) value of 0.480 indicates a large effect size, meaning that physical activity level has a strong influence on coping with workplace stress scores.

What assumptions were checked before conducting the one-way ANOVA?

Before conducting the one-way ANOVA, the assumptions of normality (checked by a QQ plot) and homogeneity of variances (checked by Levene’s test) were verified.

How was the final result of the one-way ANOVA reported in the APA format?

The final result was reported as: a one-way ANOVA showed a significant difference in coping with workplace stress scores between the different physical activity levels, with a large effect size (η² = 0.480), and significant post-hoc differences between sedentary vs. moderate and sedentary vs. high activity groups.