Maizy Lewis runs a large day care center. She wonders whether the presence of other children affects any single child’s willingness to perform simple motor tasks (assembling a puzzle, coloring a picture, etc.). She randomly selects 34 children. She isolates 18 of the children from their peers, one at a time, and asks them to perform seven simple motor tasks. She asks the remaining 16 children to do the same tasks, except that these children remain in the presence of their peers during the tasks. The data from the study are as follows

Calculate t, and compare it with the two-tailed critical t at the .05 α level. Does the presence or absence of other children significantly affect the number of tasks the children complete?

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No. of Completed Tasks by Isolated Children M = 5 SS = 25 n = 19 No. of Completed Tasks by Children With Peers M = 3.5 SS = 19 n = 17