According to Piaget, complete achievement of object permanence usually occurs around
A) one year of age. B) two years of age.
C) eighteen months of age. D) six months of age.
B
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Annie has a disorganized (disoriented) attachment relationship with her mother. In the Strange Situation she
a. probably will not be upset when her mother leaves and is likely to ignore her when she returns. b. may or may not cry when her mother leaves, but is likely to seek her when she returns. c. is likely to be upset when her mother leaves and angry and difficult to console when she returns. d. may be confused when her mother leaves and not really understand what's happening when she returns.
When the null hypothesis is rejected, then we know for certain that
a. the mean of the sample equals the mean of the population b. the mean of the sample differs from the mean of the population c. the mean of the sample is a biased estimator d. none of these, since the statistical decision is a probability statement and not a statement of certainty