Table 3: Satisfaction comparison analysis results for the proposed text interface and existing keypad interface.

	Proposed Interface	Existing Interface
Mean(SD)
usefulness	4.227(1.394)	4.841(0.865)
ease of use	4.959(1.429)	5.562(1.056)
ease of learning	6.136(0.949)	6.386(0.881)
satisfaction	5.026(1.369)	4.545(1.139)
Pairwise Comparison
usefulness	F(1,18) = 1.552, p=0.227
ease of use	F(1,18) = 1.152, p=0.296
ease of learning	F(1,18) = 0.372, p=0.549
satisfaction	F(1,18) = 0.728, p=0.403