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Table 6 T test of choice of light bulb responses by international knowledge

From: Environmental consciousness and choice of bulb for lighting in a developing country

Group (knowledge of climate change) Obs. Mean Std. err. Std. dev. [95% conf. interval]
No 620 .8209677 .0154093 .3836889 .7907069 .8512286
Yes 984 .8973577 .0096799 .3036454 .8783622 .9163533
Combined 1604 .8678304 .0084589 .3387807 .8512387 .8844222
Difference   − .07639 .0172714   − .1102669 − .0425131
diff = mean(0) − mean(1)   t = − 4.4229
Ho: diff = 0   Degrees of freedom = 1602
Ha: diff < 0 Ha: diff! = 0 Ha: diff > 0
Pr(T < t) = 0.0000 Pr(|T| > |t|) = 0.0000 Pr(T > t) = 1.0000