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Table 7 T test of choice of light bulb responses by local knowledge

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

Group (local knowledge) Obs. Mean Std. err. Std. dev. [95% conf. interval]
No 705 .8468085 .0135745 .3604277 .8201572 .8734598
Yes 899 .8843159 .0106734 .3200238 .8633682 .9052636
Combined 1604 .8678304 .0084589 .3387807 .8512387 .8844222
Difference   − .0375074 .0170226   − .0708962 − .0041186
diff = mean(0) − mean(1)   t = − 2.2034
Ho: diff = 0   Degrees of freedom = 1602
Ha: diff < 0 Ha: diff! = 0 Ha: diff > 0
Pr(T < t) = 0.0139 Pr(|T| > |t|) = 0.0277 Pr(T > t) = 0.9861