Question

A is TRUE for a Wilcoxon’s rank-sum test. B is FALSE for a
repeated measures *t*-test.

A: Assumes that the data is skewed. B: Does not require assumptions of normality. |
||

A: Sample variance is used to estimate population variance. B: Assumes the data is skewed. |
||

A: Ranking reduces the effects of extreme outliers. B: Assumes the use of only interval scales. |
||

A: Does not require assumptions of normality. B: Sample variance is used to estimate population variance. |

Answer #1

1st option is false because no assumption of skewness is done in wilcocons rank sum test and t-test cannot be conducted if the observations are not normally distributed

2nd option is false because Wilcoxon rank sum test does not estimate population variance and also repeated measures t-test has the assumption of normality and hence data cannot be skewed

3rd option is also false. Repeated-measures t-tests is conducted on continuous observations of an outcome that are normally distributed. And hence ' Assumes the use of only interval scales.' is false.

4th option is correct as Wilcoxon rank sum test is a non-parametric test that does not require assumption of normality and in repeated measures t-test, Sample variance is used to estimate population variance. Both statements are true

A is TRUE for a Wilcoxon’s rank-sum test. B is FALSE for a
repeated measures t-test. A: Assumes that the data is skewed. B:
Does not require assumptions of normality. A: Sample variance is
used to estimate population variance. B: Assumes the data is
skewed. A: Ranking reduces the effects of extreme outliers. B:
Assumes the use of only interval scales. A: Does not require
assumptions of normality. B: Sample variance is used to estimate
population variance

Consider the following data from a repeated-measures design. You
want to use a repeated-measures t test to test the null hypothesis
H0: µD = 0 (the null hypothesis states that
the mean difference for the general population is zero). The data
consist of five observations, each with two measurements, A and B,
taken before and after a treatment. Assume the population of the
differences in these measurements are normally distributed.
Observation
A
B
1
1
3
2
3
4
3...

If the outcome of a repeated-measures t test is reported as
t(23) = 2.76, what is the correct conclusion for an experiment that
tested the effect of meditation on memory?
A. The data showed a significant effect meditation on memory
with p < .05 but no significant effect with p < .01, 2-tails
test.
B. The data showed a significant effect of meditation on memory
with p < .05 and p < .01, 2-tails test.
C. The data showed a...

14. The Wilcoxon Signed Rank test is used _________
(A)
Only with independent samples
(B)
Only in matched pairs samples (dependent samples)
(C)
To test for randomness
(D)
As an alternative to the Kruskal-Wallis test
15. Which of the following test must be two-sided?
(A)
Wilcoxon Signed Rank
(B)
Kruskal-Wallis
(C)
Runs test
(D)
Sign test
16. In testing for the difference between two populations, it is
possible to use _________
(A)
The Wilcoxon Rank-Sum test
(B)
The Sign test...

Conduct a paired-samples (repeated measures) t test using the
following data:
The Dark Souls video game series has achieved meme-status as
being controller-breaking difficult. A researcher was interested in
how frustrating playing the games can be so she asked participants
to rate their base frustration levels and then had them play the
first game in the series – Dark Souls – as its seen as one of the
harder games. The data is as follows:
Participant
Before
After
A
6...

Perform a repeated-measures ANOVA on these data to
determine whether this has an effect on employee stress
self-reports. Does this policy have long-lasting effects?
Higher stress scores are equal to higher stress levels. Make sure
to test assumptions as well.
Employee
Stress time1
Stress time2 Stress Score time3
A
22
21 21
B
24
25 23
C
15
14 17
D
17
22 18
E
21
20 21
F
22
18 16
G
17
20 23
1. State the independent...

1.- A researcher obtains t = 2.25 for a
repeated-measures study using a sample of n = 10
participants. Based on this t value, what is the correct
decision for a two-tailed test?
a.
Reject the null hypothesis with α = .05 but not with
α = .01
b.
Reject the null hypothesis with both α = .05 and
α = .01
c.
Fail to reject the null hypothesis with both α = .05
and α = .01
d.
Cannot...

7. Measures of effect size for the repeated-measures
t
Previous studies have shown that playing video games can
increase visual perception abilities on tasks presented in the
gaming zone of the screen (within 5 degrees of the center). A
graduate student is interested in whether playing video games
increases peripheral visual perception abilities or decreases
attention to peripheral regions because of focus on the gaming
zone. For his study, he selects a random sample of 64 adults. The
subjects complete...

Question 2. (Wilcoxon Rank Sum Test) A random sample of n1 = 16
communities in western Kansas gave the following information for
people under 25 years of age. x1 : Rate of hay fever per 1,000
population for people under 25 98 90 120 128 92 123 112 93 125 95
125 117 97 122 127 88 A random sample of n2 = 14 regions in western
Kansas gave the following information for people over 50 years old.
x2 :...

QUESTION 1
The samples are necessarily considered a dependent when
a.
repeated measures are made on the same subjects
b.
both groups consist of males
c.
both groups consist of 8th grade pupils
d.
any of the above is true
QUESTION 2
Observations are dependent when
a.
the same subjects have been used for both sets of
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b.
subjects have been matched on some variable related to the
varialbe observed
c.
either of the above is true
d.
the...

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