Table 7.

Perceptions of task difficulty and task performance.

		Low preference Mean (SD)	High preference Mean (SD)	t (df)	P value
Look-up
	Task difficultya	2.1 (0.6)	2.0 (0.6)	0.69 (38)	.50
	Mental effortb	2.4 (0.7)	2.4 (0.6)	−0.11 (38)	.91
	Satisfactionc	4.2 (0.4)	4.1 (0.6)	0.52 (38)	.60
Exploratory
	Task difficultya	2.3 (0.4)	2.6 (0.6)	−2.01 (38)	.05
	Mental effortb	2.6 (0.5)	2.6 (0.6)	0.04 (38)	.97
	Satisfactionc	4.0 (0.5)	4.0 (0.7)	0.20 (38)	.85

^aRated on a 5-point scale (1-very easy, 5-very difficult)

^bRated on a 5-point scale (1-very small amount, 5–very large amount)

^cRated on a 5-point scale (1-very disappointed, 5–very satisfied)