Two separate samples are being used to estimate the population mean difference between two treatment conditions. Which of the following would produce the widest confidence interval?
a. n1 = n2 = 10 with a pooled variance of 10
b. n1 = n2 = 10 with a pooled variance of 100
c. n1 = n2 = 20 with a pooled variance of 10
d. n1 = n2 = 20 with a pooled variance of 100
B
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Anita is typing and starts to make mistakes when she notices that the person sitting next to her is typing much faster and making fewer mistakes. Anita's increase in mistakes is probably due to:
a. comparison b. evaluation apprehension c. mere presence d. none of the three are viable explanations
The primary method for disposal of peptide neurotransmitters is ____.
A. inactivation B. reuptake by the presynaptic neuron C. diffusion D. reuptake by the postsynaptic neuron
According to Piaget, the ability to understand that simply changing the appearance of an object does not change the object's nature is known as
a. object permanence. b. conservation. c. centration. d. reversibility. e. animism
The three types of stepfamilies are stepfather, stepmother, and
A. adjusted. B. blended. C. mixed. D. None of these choices are correct.