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. Author manuscript; available in PMC: 2010 Oct 1.
Published in final edited form as: Psychon Bull Rev. 2009 Oct;16(5):920–924. doi: 10.3758/PBR.16.5.920

Table 2.

Mean proportions of graded responses by task, domain, and typicality level, Study 1.

Category Membership
M (SD)		 Typicality
M (SD)
Animals Artifacts Animals Artifacts
Total .08 (.08) .26 (.18) .23 (.16) .18 (.15)
Typical .02 (.06) .16 (.29) .06 (.17) .06 (.14)
Atypical .16 (.22) .45 (.40) .41 (.31) .34 (.26)
Not-members .05 (.10) .16 (.22) .22 (.26) .14 (.24)

Note. For judgments about category membership, children gave more graded responses for animals than for artifacts; for total responses, χ2(1) = 19.13, p < .001, typical items, χ2(1) = 4.33, p < .05, atypical items, χ2(1) = 5.92, p < .05, and not-member items, χ2(l) = 3.88, p < .05. For judgments about typicality, the effect of domain was never significant, ps > .30. The effect of task was significant for animals; for total responses, χ2 (1) = 16.50, p < .001, atypical items, χ2(1) = 9.32, p < .01, and not-members, χ2(1) = 6.86, p < .01, and was never significant for artifacts, ps >.30.