2.5/ 2.5pts
Question 1
Assuming a 5-point difference between the two sample means, which
set of sample characteristics is most likely to produce a significant
value for the independent-measures statistic?t
Large sample sizes and small sample variances
0/ 2.5pts
Question 2
Incorrect
An independent-measures research study uses two samples, each
withn= 10 participants. If the data produce a statistic of = 2.095,t t
which of the following is the correct decision for a two-tailed
hypothesis test?
Reject the null hypothesis with = .05 but fail to reject with = .01α α
2.5/ 2.5pts
Question 3
An independent-measures study with = 6 in each sample producesn
a sample mean difference of 4 points and a pooled variance of 12.
What is the value for the statistic?t
2
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Question 4
One sample has = 18 and a second sample has = 14. If theM M
pooled variance for the two samples is 16, what is the value of
Cohen’s ?d
1.00
2.5/ 2.5pts
Question 5
An independent-measures study uses = 15 participants in eachn
group to compare two treatment conditions. What is the value fordf
thetstatistic for this study?
28
2.5/ 2.5pts
Question 6
Which combination of factors is most likely to produce a significant
value for an independent-measures statistic?t
Large samples and small variance
2.5/ 2.5pts
Question 7
Two samples, each with = 5 scores, have a pooled variance of 40.n
What is the estimated standard error for the sample mean difference?
4
2.5/ 2.5pts
Question 8
The data from an independent-measures research study produce a
sample mean difference of 6 points and an estimated standard error
of 2 points. If there are = 8 scores in each sample, what is the valuen
for the statistic?t
6/2
2.5/ 2.5pts
Question 9
Two separate samples are being used to estimate the population
mean difference between two treatment conditions. Which of the
following would produce the widest confidence interval?
n=n= 10 with a pooled variance of 100
1 2
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Question 10
For the independent-measures statistic, what is the effect oft
increasing the difference between sample means?
Increase the likelihood of rejecting and increase measures of effectH
size
0
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Question 11
One sample has = 7 scores with = 40, and a second samplen SS
hasn= 5 scores withSS= 80. The pooled variance for these
two samples is 120/10 = 12.
True
2.5/ 2.5pts
Question 12
A research study compares the mean weight for a sample ofn=
36 participants before they begin a 6-week diet and their mean
weight at the end of the diet. This is an example of an
independent-measures design.
False
2.5/ 2.5pts
Question 13
An independent-measures study produces (10) = 3.00, < .05.t p
For this study, if effect size is measured with , thenr r =
3/13.
2 2
False
