The heart and nervous system begin to form when the developing child is categorized as a(n) ________
A) fetus
B) zygote
C) embryo
D) blastocyst
Answer: C
Rationale: The embryonic stage spans weeks two through eight, during which time the embryo begins developing major physical structures such as the heart and nervous system, as well as the beginnings of arms, legs, hands, and feet.
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A researcher constructs a five-item measure of attitudes toward national health insurance. The average intercorrelations among the items is rii = .40. Using the Spearman-Brown formula, he finds that RSB = .77
What is the reliability of the scale as a whole? a. .77 b. .50 c. .40 d. Cannot be determined without knowing the sample size.
Children typically do not use the past tense in speech until about 4 years of age.
Answer the following statement true (T) or false (F)