The sex of a new organism is determined by whether
A) the X and Y chromosomes separate into sperm cells or ovum.
B) an X-bearing sperm or a Y-bearing sperm fertilizes the ovum.
C) the sperm fertilizes an X-bearing egg or a Y-bearing egg.
D) the ovum is carrying an X chromosome or a Y chromosome.
B
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What was the most critical lesson about teratogens learned from studies on the use of the drug DES by pregnant women? a. Sometimes what appear to be teratogens actually are harmless drugs
b. Infants in the late fetal period appear to be the most at risk for impact from drug-related teratogens. c. Sometimes the effects of teratogens are not apparent until long after exposure. d. Females appear to be at much greater risk from teratogens.
Measures of central tendency
a. present numbers in a pictorial format. b. describe a "typical" score in a distribution. c. allow one to generalize from small samples. d. indicate how scores differ from each other.
Amy and Liam, currently college freshmen, have been dating exclusively since their sophomore year of high school. Their early, exclusive relationship signals emotional maturity beyond their years
Indicate whether this statement is true or false.
A psychologist hypothesizes that the children with type-K personality score higher than the children with type-R personality on an memory test. The estimated standard error turned out to be 0.9, while the mean score of type-K children was 18.8 and the mean score for type-R children was 21.3. What is the t score?
A. t = (18.8-21.3)/0.92 = -3.09 B. t = (18.8-21.3)(0.3) = 8.33 C. t = (18.8-21.3)/0.9 = -2.78 D. t = (18.8-21.3)/(2)(0.9) = -1.39