Question

A rhesus monkey was trained to make same-different judgments about pairs of objects. For 50 trials, the animal was shown pictures of objects, it made correct judgments on 43 of the trials. Use the chi-square test to determine whether the animal had generalized its learned response from objects to pictures of objects. Note: the probability of making a correct response on any trial is .5. Test at alpha .05

Answer 1

	Yes	No
Observed frequencies	43	7
Expected frequencies	25	25

= 25.92

(O - E)2

H₀: The rhesus monkey did not perform significantly better than chance

H₁: The rhesus monkey significantly better than chance.

critical value = 3.84, since test statistic is greater than critical value we reject null hypothesis.

Conclusion sentence: The rhesus monkey performed significantly better than chance, Χ² (1, N = 50) = 25.92, p < .05.