For this data set

What proportion of variance in the dependent variable does the independent variable explain (excluding individual differences)

Conduct an appropriate parametric test on the data by hand and SPSS

According to Carney, Cuffy & Yam (2010) "That a person can, by assuming two simple 1-min poses, embody power and instantly become more powerful has real-world, actionable implications". Zabetipour, Pishghadam and Ghonsooly (2015) wondered whether this could help learners of English as a foreign language (EFL), in particular whether "whether open or closed postures affect EFL learners' moods". During a number of different sessions participants were asked to sit in their usual posture ("Ordinary"), in an open expansive posture ("High power") or in a closed contracted posture ("Low power"). The researchers used the Global Mood Scale (GMS) to assess their participants' feelings after each session (a high score indicates a good mood).

Simulated data based on the reported means and standard deviations for a sample of 14 students