What is the number of scores at or below a given value of a variable?
a. percentile rank
b. cumulative proportion
c. frequency proportion
d. cumulative frequency
Ans: D
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What percentage of the population is described as gifted, according to IQ standards?
a) about .01 percent b) about 1 percent c) around 2 percent d) nearly 10 percent
For a normal distribution, the z-score boundary that separates the highest 2.5% of the scores from the rest is z = –1.96
Indicate whether the statement is true or false
Research by Anne Treisman has demonstrated that
a. focused attention produces many more errors than distributed attention. b. in focused attention, an unusual stimulus appears to "pop out" from the other stimuli in the display. c. illusory conjunctions are especially likely when people perform a task at a leisurely rate. d. when people use focused attention, they typically perceive a figure whose shape is linked with its appropriate color.
As sample variance _____, the value of the t test _____
a. increases; increases b. decreases; decreases c. increases; decreases d. increases; stays the same