An experimental psychologist believes that memory for pictures is superior to memory for words. To test this hypothesis, eight randomly selected students view 30 slides with nouns printed on them, and another group of eight randomly selected students views 30 slides with pictures of the same nouns. After reviewing the slides, subjects are given a recall test, and the number of correctly remembered items is measured.

Which statistical procedure is used?

a. independent sample t test

b. ancova

c. chi square

d. multiple regression

e. manova