The 95% confidence interval for the difference between two means is [-2.38, 4.67]. At the .05 level of significance, the two means are significantly different from each other.

Anne is 20 years old, and she has spoken English all her life. She has taken Spanish courses in both high school and college

She enrolls in a study-abroad program in Buenos Aires and becomes fluent in Spanish, before returning to the United States. Anne's situation is an example of a. sequential bilingualism. b. simultaneous bilingualism. c. metalinguistics. d. multilingualism.

Shape, size, and brightness are all types of perceptual __________.

A. closure B. constancy C. reversibility D. coherency