Dr. Alimam is studying infants’ ability to distinguish shapes. He shows an infant a shape until the infant loses interest in the shape, and then he shows the infant a different shape. If the infant shows

interest in the new shape, he determines that the infant recognizes that the new shape is different from

the old one. Dr. Alimam expects that getting older will cause the babies to recognize shapes faster. He

records how long it takes the infant to show interest in the new shape.

Dr. Alimam conducts the study using a group of 5 three-month infants, 5 six-month infants, and 5 eight

month infants recruited from local day-care centers. Because he knows the directors, he does not

contact the infants' parents to inform them of the study. Below is a chart that shows the time it took for

each infant to show interest in the new shape. Dr. Alimam concludes that eight-month old infants are