Within the peppered moth species, which trend in wing color has been observed over the past 250 years?
a. Light-dark
b. Dark-light
c. Light-dark-light
d. Dark-light-dark
e. Dark-light-dark-light
Ans: c. Light-dark-light
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An identity __________ is a young person who most likely comes from a rejecting and distant family
a. achiever b. forecloser c. refuser d. diffuser
Recent studies indicate that women are more likely to breast-feed if they
a. are older. b. were born outside the United States. c. have less education. d. have an influential person who encourages breast-feeding.
The principal finding in Reynolds’s (1975) experiment with pigeons and a yoked experimental design was that
a. ratio schedules produce greater resistance to extinction than interval schedules do. b. pauses following reinforcement are longer with ratio schedules than interval schedules c. VR schedules produce higher rates of responding than VI schedules do. d. Both FI and FR schedules produce a scalloped response pattern in the cumulative record.
The t statistic differs from z in that
a. it applies to variances. b. it is used when population variances are not known. c. it involves an assumption of normality. d. and b) but not c).