A 3-month-old and a 15-month-old infant both complete the norm-referenced Bayley Scales of Infant Development-II. The 3-month-old obtains a standardized score of 52; the 15-month-old obtains a standardized score of 51. Standardized scores have a mean of 50, and a standard deviation of 10. What do these results suggest about the children's performance?

Question

Quizplus · Accepted Answer

Both children's standardized scores fall within 1 standard deviation of the mean score, indicating that they are developing adequately for their age. Therefore, D (Both children seem to be developing adequately) is the correct choice. There is no indication of a developmental delay in either child based on their scores. Furthermore, the children may not have completed the same items on the assessment due to differences in the age-specific items included in the test.

A 3-Month-Old and a 15-Month-Old Infant Both Complete the Norm-Referenced