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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