Which one of the following represents a discrete variable?
a. number of children per family
b. amount of water consumed daily by a laboratory rat
c. noon temperature measured in Celsius
d. rate of bar-pressing
a
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Early 20th-century research on the effects of child labor was conducted by ____.?
a. ?Calkins b. ?Woolley c. ?Hollingworth d. ?Anastasi e. ?Radcliffe
In a freak accident involving ice, a potato gun, and a ballpoint pen, Justin damages part of his ear. Now, Justin can no longer generate vibrations that match the sound waves entering his ear. Justin most likely damaged his
A. cochlea. B. organ of Corti. C. basilar membrane. D. eardrum
The inner layer of the blastocyst that will become the embryo is the ____
a. umbilical cord b. placenta c. embryonic disk d. trophoblast
According to Erikson, when do we all pass through the trust-versus-mistrust stage?
a) first 18 months of life b) first 12 months of life c) first 2 years of life d) first 5 years of life