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independent-groups t test
a parametric inferential test for comparing sample means of two independent groups of scores.
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standard error of the difference between means
standard deviation of the sampling distribution of differences between the means of independent samples in a two-sample experiment.
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effect size
the proportion of variance in the dependent variable that is accounted for by the manipulation of the independent variable.
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cohen's d
an inferential statistic for measuring effect size.
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correlated-groups t test
parametric infrential test used to compare the means of two related (within- or matched-subjects) samples.
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difference scores
scores representing the difference between subjects' performance in one condition and their performance in a second condition.
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standard error of the difference scores
the standard deviation of the sampling distributio of mean differences between dependent samples in a two-group experiment.
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wilcoxon rank-sum test
a nonparametric inferential test for comparing sample medians of two independent groups of scores.
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wilcoxon matched-pairs signed-ranks T test
a nonparametric inferentil test for comparing sample medians of two dependent or related groups of scores.
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chi-square (x2) test of independence
nonparametric inferential test used when frequency data have been collected to determine how wellan observed breakdown of people over various categories fits some expected breakdown.
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phi coefficient
an inferential test used to determine effect size for a chi-square test.
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a(n) ___ is a parametric inferential test for comparing sample means of two independent group of scores.
independent-groups t test
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___ is an inferential statistic for measuring effect size with t tests.
cohen's d or r2
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a(n) ___ is a parametric inferential test used to compare the means of two related samples.
correlated-groups t test
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when using a correlated-groups t test, we calculate __, scores representing the difference between subjects' performance in one condition and their performance in one condition and their performance in a second condition.
difference scores
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the standard deviation of the sampling distribution of mean differences between dependent samples in a two-group experiment is the ___.
standard error of the difference scores
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___ and ___ frequencies are used in the calculation of the x2 statistic.
observed; expected
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the nonparametric inferential statistic for comparing two groups of differentpeople when ordinal data are collected is the ____.
wilcoxon rank-sum test
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when frequency data are collected, we use the ___ to determine how well an observed frequency distribution of two nominal variables fits some expected breakdown.
x2 test of independence
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effect size for a chi-square test is determined by using the ____.
phi coefficient
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the wilcoxon ___ test is used with within-subjects designs.
matched-pairs signed-ranks T
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the wilcoxon rank-sum test is used with ___ designs.
between-subjects
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chi-square tests use ___ data, whereas wilcoxon tests use ___ data.
nominal; ordinal
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when comparing the sample means for two unrelated groups we use the:
indepnedent-groups t test
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the value of the t test will ___ as sample variance decreases.
increase
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which of the following t test results has the reatest chance of statistical significance?
t(28) = 3.12
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if the null hypothesis is false, then the t test should be:
greater than 1
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imagine that you conducted an independent-groups t test with 10 participants in each group. for a one-tailed test, the tcv at ∝=.05 would be:
±1.734
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if a researcher reported for an independent-groups t test that t(26)= 2.90, p < .005, how many subjects were there in the study?
28
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Ha: µ1≠µ2 is the __ hypothesis for a __-tailed test.
alternative; two
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cohen's d is a measure of ___ for a ___.
effect size; t test
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tcv = 2.15 and tobt = -2.20. Based on these results we:
reject H0
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If a correlated-groups t test and an independent-groups t test both have df = 10, which experiment used fewer subjects?
the correlated-groups t test
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if researchers reported that, for a correlated-groups design, t(15) = 2.57, p < .05, you can conclude that:
a total of 16 people participated in the study.
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parametric is to nonparametric as ___ is to ___.
t test; x2 test
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which of the following is an assumption of x2 tests?
the sample should be randomly selected
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the calculation of the df for the ___ s (r-1) (c-1)
x2test of independence
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the __ is a measure of effect size for the ____.
phi coefficient; x2 test of independence
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the wilcoxon rank-sum test is used with __ data.
ordinal
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wilcoxon rank-sum test is to __ desighn as wilcoxon matched-pairs signed-ranks t test is to __ design.
between-subjects; within-subjects
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