Question: A variety of research results suggest that visual images interfere with visual perception. In one study, Segal and Fusella (1970) had participants watch a screen, looking for brief presentations of a small blue arrow. On some trials, the participants were also asked to form a mental image (for example, imagine a volcano). The results show that participants made more errors while forming images than while not forming images. Data similar to the Segal and Fusella results are as follows. Do the data indicate a significant difference between the two conditions? Use a two-tailed test with a = 05.

Participant Errors with image Errors without image

A 13 4

B 9 2

C 12 10

D 7 8

E 10 6

F 8 6

G 9 4