D
US verified expert
Dr. Maya Chen
Research Psychologist · PhD Psychology — UCLA
PhDStats Expert
Quantitative methods and cognitive psychology across undergraduate and graduate research.
Questions solved by Dr. Maya Chen
- Interpret an independent samples t-test in APA format
The difference is significant at p < .05, with group one scoring higher. APA reporting includes means, SDs, t, df, p and an effect size.
- Evaluate ∫ x·e^x dx using integration by parts
Let u = x and dv = e^x dx, giving x·e^x − e^x + C. LIATE picks the algebraic term as u.
- Multiple regression of patient length of stay on costs
Length of stay is the strongest predictor of cost. The model explains about 64% of variance (R² = .64).
- Compare Piaget and Vygotsky on cognitive development
Piaget stresses stage-based individual discovery, while Vygotsky emphasises social interaction and the zone of proximal development. Modern classrooms blend both through scaffolding.