Greg Is 10 Months Old, and He Refuses to Crawl

question 14

Multiple Choice

Greg is 10 months old, and he refuses to crawl across the visual cliff even though his mother is encouraging him to do so. When he was 6 months old, he squirmed across it without hesitation. What has changed for Greg?

• A) He has matured into understanding that crawling over an edge affords falling.
• B) His visual system has matured sufficiently to detect depth.
• C) He has developed an insecure attachment with his mother.
• D) He must have fallen from an elevated height since his last test on the visual cliff.

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Definitions:

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Military or political power exerted by European countries, historically significant in various global conflicts, colonization, and international relations.

Confidence Interval

A series of outcome numbers, from sample statistics, expected to contain within the unknown value of a population attribute.

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Confidence Interval

An interval estimate of a population parameter that is computed from sample data, indicating the reliability of an estimate.