ISDS 3110 FINAL EXAM GUIDE Practice
Questions & 100% Correct Answers
When referring to a scatterplot, the polarity (+,-) of the correlation coefficient r
corresponds to the _______ of the association. - ANSWER>>Direction
When would the median be a better measure of central tendency than the mean?
- ANSWER>>The data contains an obvious outlier
The standard deviation squared is also known as the ______. -
ANSWER>>Variance
If comparing frequency histograms, which of the following is true of the
histogram with greater variability? - ANSWER>>Greater spread of scores away
from line of central tendency
According to Cohen's descriptions, a correlation coefficient r of -0.45 would
describe a correlation of _____ strength. - ANSWER>>medium, moderate
A correlation coefficient r of -1 is the strongest possible correlation -
ANSWER>>True
While reading about a research study, which of the following would tell you that
an association claim is being made? - ANSWER>>Both Variable are measured
Measurement of 2 variables
Martin has found a correlation of r = .18 between the two variables of using
prescription stimulants (e.g., Adderall) and frontal lobe activity. This correlation is
more likely to be statistically significant if: - ANSWER>>Martin Used a larger
number of subjects
,Which of the following questions is NOT necessary to ask when interrogating
statistical validity? - ANSWER>>Is random assignment affecting the findings?
A negative association means that as one variable increases, so does the other. -
ANSWER>>False
Statistical significance is dependent on the sample size and effect size. -
ANSWER>>True
When conducting an experiment, what is provided by the independent variable? -
ANSWER>>A comparison group
Random selection enhances _________ validity and random assignment enhances
_________ validity. - ANSWER>>external; internal
Counterbalancing is used to control selection effects in an expriment. -
ANSWER>>False
A threat to internal validity occurs only if a potential design confound varies with
the independent variable systematically. - ANSWER>>True
Which of the following is a necessary component of a longitudinal design? -
ANSWER>>Measuring the same variables at two points in time
Which popular media headline does NOT suggest that a multiple regression has
been used? - ANSWER>>"Daughters are happier when their mothers are happy
working outside of the home"
In a multiple regression design, _________ variable is to dependent variable as
_________variable is to independent variable. - ANSWER>>criterion; predictor
, Cross-lag correlations are helpful for addressing internal validity. -
ANSWER>>False
The main reason a researcher interested in making a causal claim would NOT do
an experiment is the ethical limitation of manipulating a particular variable. -
ANSWER>>True
If you would rather make a false negative claim than a false positive claim, which
significance level would you use? - ANSWER>>.01
The alpha level is equal to the - ANSWER>>Probability of making a type 1 error
When calculating the F value and the within-groups variability is greater than the
between groups variability, the F value will be - ANSWER>><1
The midpoint of the F value normal distribution is - ANSWER>>1
A greater sample size reduces variability. - ANSWER>>True
Hypothesis: "When serving from a larger bowl, the amount consumed will
increase."
The correct Null Hypothesis would be: "When serving from a larger bowl, the
amount consumed will decrease." - ANSWER>>False
According to lecture, why is it important to study interactions? - ANSWER>>Many
behaviors and outcomes in psychology are interactions.
Dr. Gavin is conducting a 2 x 4 independent-groups factorial design. Assuming he
wants 25 people in each cell, how many participants does Dr. Gavin need to
recruit? - ANSWER>>200
Questions & 100% Correct Answers
When referring to a scatterplot, the polarity (+,-) of the correlation coefficient r
corresponds to the _______ of the association. - ANSWER>>Direction
When would the median be a better measure of central tendency than the mean?
- ANSWER>>The data contains an obvious outlier
The standard deviation squared is also known as the ______. -
ANSWER>>Variance
If comparing frequency histograms, which of the following is true of the
histogram with greater variability? - ANSWER>>Greater spread of scores away
from line of central tendency
According to Cohen's descriptions, a correlation coefficient r of -0.45 would
describe a correlation of _____ strength. - ANSWER>>medium, moderate
A correlation coefficient r of -1 is the strongest possible correlation -
ANSWER>>True
While reading about a research study, which of the following would tell you that
an association claim is being made? - ANSWER>>Both Variable are measured
Measurement of 2 variables
Martin has found a correlation of r = .18 between the two variables of using
prescription stimulants (e.g., Adderall) and frontal lobe activity. This correlation is
more likely to be statistically significant if: - ANSWER>>Martin Used a larger
number of subjects
,Which of the following questions is NOT necessary to ask when interrogating
statistical validity? - ANSWER>>Is random assignment affecting the findings?
A negative association means that as one variable increases, so does the other. -
ANSWER>>False
Statistical significance is dependent on the sample size and effect size. -
ANSWER>>True
When conducting an experiment, what is provided by the independent variable? -
ANSWER>>A comparison group
Random selection enhances _________ validity and random assignment enhances
_________ validity. - ANSWER>>external; internal
Counterbalancing is used to control selection effects in an expriment. -
ANSWER>>False
A threat to internal validity occurs only if a potential design confound varies with
the independent variable systematically. - ANSWER>>True
Which of the following is a necessary component of a longitudinal design? -
ANSWER>>Measuring the same variables at two points in time
Which popular media headline does NOT suggest that a multiple regression has
been used? - ANSWER>>"Daughters are happier when their mothers are happy
working outside of the home"
In a multiple regression design, _________ variable is to dependent variable as
_________variable is to independent variable. - ANSWER>>criterion; predictor
, Cross-lag correlations are helpful for addressing internal validity. -
ANSWER>>False
The main reason a researcher interested in making a causal claim would NOT do
an experiment is the ethical limitation of manipulating a particular variable. -
ANSWER>>True
If you would rather make a false negative claim than a false positive claim, which
significance level would you use? - ANSWER>>.01
The alpha level is equal to the - ANSWER>>Probability of making a type 1 error
When calculating the F value and the within-groups variability is greater than the
between groups variability, the F value will be - ANSWER>><1
The midpoint of the F value normal distribution is - ANSWER>>1
A greater sample size reduces variability. - ANSWER>>True
Hypothesis: "When serving from a larger bowl, the amount consumed will
increase."
The correct Null Hypothesis would be: "When serving from a larger bowl, the
amount consumed will decrease." - ANSWER>>False
According to lecture, why is it important to study interactions? - ANSWER>>Many
behaviors and outcomes in psychology are interactions.
Dr. Gavin is conducting a 2 x 4 independent-groups factorial design. Assuming he
wants 25 people in each cell, how many participants does Dr. Gavin need to
recruit? - ANSWER>>200
