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psych_stats midterm 3 (1)
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psych/stats midterm 3With a population what is the denominator of standard deviation - CORRECT
ANSWER-N
With a sample what is the denominator of standard deviation - CORRECT
ANSWER-N - 1
when do you use t distributions - CORRECT ANSWER-when you don't know o
(standard deviation)
How does t distribution compare to z distribution - CORRECT ANSWER-t varies with
sample size, it is wider and flatter than the z distribution
degrees of freedom - CORRECT ANSWER-number of scores that are free to vary
when we estimate a population parameter from a sample
degrees of freedom for one sample t test - CORRECT ANSWER-N-1
when do we use the one sample t test - CORRECT ANSWER-one population, when
we know the means but not standard deviation
one sample t test - CORRECT ANSWER-(M - um)/sm
Sm - CORRECT ANSWER-s/sqrt (N)
when do you reject the null hypothesis - CORRECT ANSWER-if above or below the
crit values
how to calculate high and low for confidence interval - CORRECT ANSWER-+-t(Sm)
+M
cohens d - CORRECT ANSWER-(M-u)/s
small effect size - CORRECT ANSWER-0.2, 85%
medium effect size - CORRECT ANSWER-0.5, 67%
large effect size - CORRECT ANSWER-0.8, 53%
APA reporting statistics style - CORRECT ANSWER-t(df) = (t stat), p < (p val), d =
cohens
t(40) = 7.00, p < 0.001, d = 1.09
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