Mean rating on a 1–5 scale · n = 412
Chart data
| Group | n | Mean | 95% CI |
|---|---|---|---|
| 18–29 | 146 | 3.65 | 3.52–3.77 |
| 30–44 | 158 | 3.40 | 3.28–3.52 |
| 45+ | 108 | 2.90 | 2.75–3.05 |
Mean rating on a 1–5 scale · n = 412
Chart data
| Group | n | Mean | 95% CI |
|---|---|---|---|
| 18–29 | 146 | 3.65 | 3.52–3.77 |
| 30–44 | 158 | 3.40 | 3.28–3.52 |
| 45+ | 108 | 2.90 | 2.75–3.05 |
Survey analysis across three age groups
- Problem
- Does the rating of an online training course differ between age groups?
- Data
- Survey: 412 respondents, a 5-item scale (answers 1–5), three age groups.
- Work
- Scale reliability (Cronbach’s alpha), means with 95% confidence intervals, Kruskal–Wallis test (ordinal data), effect size.
- Result
- Reliable scale (α = 0.89). Ratings differ between groups (H = 48.0, p < 0.001), with a moderate effect (ε² = 0.11): the 18–29 group rates highest (3.65), the 45+ group lowest (2.90).
- Tools
- R
Sample input files: survey data (CSV)