The t test enables researchers to evaluate the probability that _____ was caused by the independent variable
a. the differences between the groups before data collection
b. the extreme score in the control group, if there was one,
c. the difference between the group means
d. all of these
C
The t test evaluates the probability that the difference between the group means occurred by chance. Knowing that probability enables researchers to decide whether the independent variable was likely to have caused the difference.
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A girl who does not develop breasts or menstruate
a. likely produces low levels of testosterone. b. may have only one Y sex chromosome. c. may have Turner syndrome. d. should be screened for Klinefelter syndrome.
In February in New York, the daily high temperatures are typically low with only a few relatively warm days. A frequency distribution showing the daily high temperatures would probably form a negatively skewed distribution
Indicate whether the statement is true or false
In a well-known study conducted by Schachter and Singer, wherein participants were injected either with a stimulant or a placebo and were then exposed to a highly emotional stimulus, it was found that participants showed the strongest emotional reactions when ____
a. they were injected with a stimulant (and knew it) b. they were injected with a stimulant (but didn't know it) c. they were injected with a placebo (and knew it) d. they were injected with a placebo (but didn't know it)
Ken is planning on studying the influence of intelligence on the ability to recall events from the 1960s. If Ken does not account for variables such as age that could also influence one's ability to recall these events, age could be considered a(n) ______
a) random variable. b) dependent variable. c) confounding variable. d) independent variable.