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 |