PSYC 2301 Final Exam || with A+ Guaranteed Solutions.
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PSYC 2301
One problem with using the range as the measure of variability is that.... correct answers it depends on just two of the scores in the distribution
Measure of ________ indicate how scores are spread out in a distribution, while measures of _______ represent sample scores as a whole correct answe...
one problem with using the range as the measure of
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PSYC 2301 Final Exam || with A+ Guaranteed Solutions.
One problem with using the range as the measure of variability is that.... correct answers it
depends on just two of the scores in the distribution
Measure of ________ indicate how scores are spread out in a distribution, while measures of
_______ represent sample scores as a whole correct answers Variability and Central Tendency
Suppose we test just a sample of people. If the test fairly represents the population we are
interested in, then we are said to have correct answers External Validity in the study
You conduct an experiment with a 2x2 design. When you analyze the results you observe a
"classic" interaction. What does this tell you about the main effects of the study? correct answers
There are no main effects/main effects are not significant
When the standard score = -1, what is the percentile of the raw score? correct answers 16
Dr. Rand M. Zation conducted a study to examine the effects of a drug versus a placebo. He
decided to test the effect using a within subjects design. In order to do this properly, he had to
add a between-subjects factor that allowed him to control for correct answers order effects
An extraneous variable (EV) that co-varies with the independent variable is a confounding
variable only if we also can state..... correct answers A plausible reason how the EV might have
affected the DV
How many independent variables (factors) are in a 2x2x3x3 design? correct answers 4
You design an experiment that manipulates the following factors (and levels): method of
presenting material (visual, auditory); difficulty of material (easy, difficult); and amount of
material (low, moderate, high). For a completely independent between-group design with 10
participants per group, how many participants will you need? correct answers 120
In a normal distribution, the mean is 25, the standard deviation is 6. if the standard score z=2,
what is the raw score? correct answers 37
If a frequency distribution, what do we put on the y-axis (the vertical axis)? correct answers The
frequency of the dependent variable
An interaction exists when.... correct answers The effects of one variable depend upon the level
of another variable
We have a 3-way interaction when the effect of one independent variable depends upon the
_______ of two other independent variables. correct answers levels
In a skewed frequency distribution, which measure of central tendency is generally considered to
be the most useful one? correct answers The Median
, "I wonder if adults are more generous if their parents made them give 10% of their allowance to
charity when they were children? When we put this question in standard form, we get? correct
answers What is the effect of being made to give 10% of one's allowance to charity when one is
a child on the amount given to charity when one is an adult?
Consider the sentence. "Bob is more anxious than he is intelligent." this sentence only makes
sense it.... correct answers Bob's standard score (z-score) on the anxiety scale is higher than his
standard score on the intelligence scale.
When the standard deviation is 7, z-score=2, and x=28, what is the mean? correct answers 14
You calculate the descriptive statistic from an exam you have given. Here is what you come up
with: The Frequency distribution is normally shaped, the mean score = 45, the Variance = 16.
you know that the mean = 45, is at the 50th percentile. What score is at the 98th percentile?
correct answers 53
In a three-factor experiment, how many main effects and interaction do we have to evaluate?
correct answers 7
In a normal frequency distribution, about what percentage of the scores lie between z= -1 and z =
2? correct answers 82
A person is at the 84th percentile on a standardized test. Given that the sample mean is 60 and
SD=9, what is this person's raw score? correct answers 69
When we describe our data, we list three basic properties of the frequency distribution. One of
them is the shape of the distribution. The other two are: correct answers measures of central
tendency, and variability
In working with a normal distribution it is very handy to know the following 3 numbers: correct
answers 34, 14, 2
List two reasons why we might choose to use a multi-factor design: correct answers Greater
approx. of the real world conditions.
Examine whether independent variables interact with one another.
Several variables may affect the same DV
A researcher measured how much violent television children watched at home and also observed
their aggressiveness on the playground. The researcher used the _________ method correct
answers Naturalistic Observation
Compute the standard score (z-score) for x, when x = 21, then mean of the distribution = 27, and
the variance = 9 correct answers z = -2
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