PSYC 2005- EXAM 1 Questions With 100% Verified Correct Answers.
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Course
PSYC 2005
Institution
PSYC 2005
central tendency - correct answer typical or most representative value of a group of scores
outlier - correct answer score with an extreme value (very high or very low) in relation to the other scores in the distribution
...
-situation in which many scores pile up at the high end of a distribution (creating skewness to the left)
because it is not possible to have a higher score
floor effect - correct answer -positively skewed
,-situation in which many scores pile up at the low end of a distribution (creating skewness to the right)
because it is not possible to have any lower score
normal curve - correct answer
variance - correct answer measure of how spread out a set of scores are; average of
the squared deviations from the mean
standard deviation - correct answer -square root of the average of the squared
deviations from the mean
-the most common descriptive statistic for variation
-approximately the average amount that scores in a distribution vary from the mean
hypothesis testing - correct answer procedure for deciding whether the outcome of
a study (the results) supports a particular theory or practical innovation
hypothesis - correct answer prediction, often based on informal observation,
previous research, or theory, that is tested in a research study
theory - correct answer set of principles that attempt to explain one or more facts,
relationships, or events; psychologists often derive specific predictions from theories that are then
tested in research studies
research hypothesis - correct answer statement in hypothesis testing about the
predicted relation between populations
-prediction of a difference of between population means
null hypothesis - correct answer -statement about a relation between populations
that is opposite of the research hypothesis
-statement that in the population there is no difference between populations
comparison distribution - correct answer distribution used in hypothesis testing
, -represents the population situation if the null hypothesis is true
-distribution into which you compare the score based on the sample's results
cutoff sample score (critical value) - correct answer point in hypothesis testing on
the comparison distribution, where if it's reached or exceeded by the sample score, you reject the null
hypothesis
statistically significant - correct answer conclusion that the results of a study would
be unlikely if in the sample studied represents a population that is no different from the population in
general
-null hypothesis is rejected
directional hypothesis - correct answer research hypothesis predicting a particular
direction of difference between populations
one-tailed test - correct answer hypothesis-testing procedure for a directional
hypothesis
-the region of the comparison distribution in which the null hypothesis would be rejected is all on one
side of the distribution
nondirectional hypothesis - correct answer research hypothesis that does not
predict a particular direction of difference between the population like the sample studied and the
population in general
two-tailed test - correct answer hypothesis--testing procedure for a nondirectional
hypothesis
-region of the comparison distribution in which the null hypothesis would be rejected is divided between
the two sides of the distribution
decision errors - correct answer incorrect conclusions in hypothesis testing in
relation to the real (but unknown) situation, such as deciding the null hypothesis is false when it is really
true
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