Susan suspected that her pet hamster was chubbier than her roommate's hamster. She weighed each critter 20 times on different occasions and found out that her hamster weighed 250 g on average, whereas her roommate's hamster weighed 160 g on average. What statistical test should she use?

a) z test d) t test for dependent (correlated) samples

b) t test for single sample e) F test (ANOVA)

c) t test for independent (unmatched) samples f) chi-square tes