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Table 3 Welch t-Test between treatment and larger control group

From: Designing an integrated socio-technical behaviour change system for energy saving

  Treatment Group   Larger Control Group
Mean 5.81   0.20
Variance 354.16   6.40
Observations 66   558
Hypothesized Mean Difference   0  
df   65  
t Stat   2.419  
P(Tt) two-tail   0.018  
t Critical two-tail   1.99