PSYC3301 Combined Test || Questions and 100% Accurate
Answers.
According to the lectures, what are the three reasons we do statistics? correct answers don't have
access to the population of interest;
measure the magnitude of an effect;
test assumptions
The collection of units to which we want to generalize a set of findings is known as a.... correct
answers Population
A smaller collection of units from a population used to determine truths about the population is
known as a... correct answers sample
In statistics, for what does p stand? correct answers Probability
Once you have obtained a statistically significant effect, and you have satisfied the assumptions
associated with a statistic, what should you always do next? correct answers Calculate effect size
What is a standardized measure of the strength of association between two variables measured on
an interval/ratio scale? correct answers Pearson Correlation
If larger values associated with one variable are associated with larger values of another variable,
the correlation is said to be... correct answers Positive
If larger values associated with one variable are associated with smaller values of another
variable, the correlation is said to be... correct answers Negative
According to Cohen (1992), a small correlation is equal to... correct answers .10
According to Cohen (1992), a medium correlation is equal to... correct answers .30
According to Cohen (1992), a large correlation is equal to... correct answers .50
The proportion of variance in one variable accounted for by another variable is known as the...
correct answers coefficient of determination.
To obtain the coefficient of determination, one must ____ a correlation coefficient correct
answers square
According to Cohen's (1992) guidelines, a large correlation would imply that ____ of the
variance in one variable is accounted for by another variable. correct answers 25%
An unstandardized version of the Pearson correlation is known as... correct answers Pearson
Covariance
,A Pearson correlation can take on any value between... correct answers -1.0 and 1.0
A Pearson covariance can take on any value between... correct answers - infinity and + infinity
The main disadvantage associated with the Pearson covariance is that it is... correct answers
difficult to interpret
A commonly used measure of association between two variables measured with ranks is the...
correct answers Spearman Correlation
A commonly used measure of association between two variables when one or both are highly
skewed is the... correct answers Spearman Correlation
The chances of rejecting the null hypothesis erroneously is known as... correct answers Type I
error rate.
In typical behavioral sciences research, what is the maximum specified acceptable rate of
rejecting the null hypothesis falsely? correct answers 5% (or .05)
The chances of committing a Type I error across a series of statistical comparisons is known as...
correct answers Familywise error rate
Across three statistical analyses based on the same sample of data, the chances of rejecting the
null hypothesis falsely is equal to... correct answers .143
A statistic that tests multiple null hypotheses simultaneously is known as an _____ statistic.
correct answers Omnibus statistic
What is the main benefit of conducting an omnibus statistic? correct answers Can help protect
against committing a type 1 error.
Although people use the term 'Cohen's d', what they are really reporting in published papers is?
correct answers Hedge's g
ANOVA stands for... correct answers Analysis of variance
It's called analysis of variance, rather than analysis of means, because... correct answers ANOVA
is fundamentally based on the ratio of the variability between the means to the variability
between individual observations.
A statistic that can be used to test the hypothesis that three or more between group means are
equal simultaneously is known as? correct answers Between groups ANOVA
A statistic that can be used to test the hypothesis that three or more dependent means are equal
simultaneously is known as... correct answers Repeated measures ANOVA
,What is the Cohen's d formula? correct answers (Mean1 - Mean2) / [(SD1 + SD2)/2]
The number of values that are free to vary with respect to a sums of squares term within an
ANOVA table is known as... correct answers the degrees of freedom
In a between groups ANOVA with three groups and equal sample sizes of 10 in each of the
groups, the degrees of freedom are equal to... correct answers 2, 27, 29
Suppose you conducted a study where the main result was based on a between groups ANOVA
with three groups and equal sample sizes of 10 in each of the groups. What two degrees of
freedom would you report with the ANOVA results? correct answers 2, 27
Within the context of ANOVA, when you divide the sums of squares by the degrees of freedom
you get the ... correct answers mean squares
Within the context of ANOVA, when you divided the between groups and within groups of
mean squares values, you get... correct answers F-value
the statistical significance associated with an ANOVA is based on the obtained F-value and the...
correct answers degrees of freedom
All other things equal, an ANOVA associated with greater within groups degrees of freedom will
be associated with... correct answers greater statistical power
In the context of between-groups ANOVA, the convention method of reporting the strength of
effect is ... correct answers Eta squared (or η2)
Within the context of ANOVA, what is the eta squared formula? correct answers
SSBetween/SSTotal
Although eta squared is commonly reported as a measure of effect size, it is known to be an ____
at the population level. correct answers overestimate
In the context of ANOVA, the most accurate estimate of effect size is known as... correct
answers Omega squared
Calculate the F value associated with the below ANOVA table. The total sample size is 30 What
is the F value? correct answers 2.84 (based on the work below; you wouldn't have to show the
work in the exam; NB: in the exam, the numbers in the table will likely be different so that one
does not have to simply memorize "2.84")
Statistical tests of the difference between means that is conducted after obtaining a statistically
significant ANOVA are known as... correct answers Post-hoc tests
, Statistical tests such as post-hoc tests and planned comparisons are known as... correct answers
Multiple comparison procedures
What statistical analysis can be performed with the SPSS window below? correct answers
Oneway between groups ANOVA
In order to get SPSS to estimate eta squared, the ANOVA must be conducted within... correct
answers The General Linear Model option
If one obtains a statistically significant between groups ANOVA with only three groups, the
most powerful post-hoc procedure that keeps the familywise error rate at .05 is... correct answers
Fishers LSD
Strictly speaking, what are the five assumptions associated with the Between Groups ANOVA
correct answers Random sampling;
independence of observations;
dependent variable measured on an interval/ratio scale;
normally distributed data;
homogeneity of variance
ANOVA is robust to violations of normally distributed data, so long as skew and kurtosis are
less than ____ and ____, respectively. correct answers |2| and |9|
ANOVA is robust to violations of variance heterogeneity, so long as the difference between the
smallest and largest samples is not greater than ____ and the difference in the variances is not
greater than ____. correct answers 40%; 8
If the variances between two groups is very substantially different and the sample sizes are
substantially unequal, an attractive (i.e., robust) alternative to test the hypothesis of equal means
is... correct answers Welch's t-test
If the difference between two or more variances is very substantial and the sample sizes are
substantially unequal, an attractive (i.e., robust) alternative to test the hypothesis of equal means
is... correct answers Brown-Forsythe F-test
According to Cohen (1992), a small Cohen's d value is equal to... correct answers .20
According to Cohen (1992), a medium Cohen's d value is equal to... correct answers .50
According to Cohen (1992), a large Cohen's d value is equal to... correct answers .80
The alpha level one specifies for each analysis is known as the... correct answers per contrast
error rate
the per contrast error rate is almost always specified at... correct answers .05
