One limitation of ordinal measurements is that they do not determine how much di
ID: 3171886 • Letter: O
Question
One limitation of ordinal measurements is that they do not determine how much difference there is between two individuals.
True
False
0.5 points
QUESTION 2
To compute the Mann-Whitney U, you first rank the scores in each sample separately.
True
False
0.5 points
QUESTION 3
What type of research study produces data appropriate for a Mann-Whitney U-test?
an independent-measures study with exactly two treatments.
an independent-measures study with more than two treatments.
a repeated-measures study with exactly two treatments.
a repeated-measures study with more than two treatments.
0.5 points
QUESTION 4
How is the final Mann-Whitney U determined?
the larger of the two U values computed for the two samples
the smaller of the two U values computed for the two samples.
the sum of the two U values computed for the two samples.
the difference between the two U values computed for the two samples.
0.5 points
QUESTION 5
An independent-measures research study comparing two treatments with n = 6 participants in each treatment produces the following set of ranks: Sample #1 has ranks of 1, 2, 3, 4, 5, and 7; Sample #2 has ranks of 6, 8, 9, 10, 11, and 12. What is the value of the Mann-Whitney U for these data?
U = 1
U = 6
U = 15
U = 50
1 points
QUESTION 6
Based on information from Question 5, determine the Ucritical value for a two-tailed test and alpha = .05
Ucritical = 4
Ucritical = 5
Ucritical = 6
Ucritical = 7
1 points
QUESTION 7
If Mann-Whitney U = 10 and Ucritical = 8, then you can conclude that a significant difference occurred (thus rejecting the null hypothesis).
True
False
an independent-measures study with exactly two treatments.
an independent-measures study with more than two treatments.
a repeated-measures study with exactly two treatments.
a repeated-measures study with more than two treatments.
Explanation / Answer
Answer 1: True, Ordinal scale do not detemine how much is the difference bwtween two individuals.
Answer 2: False, the rank is calculated by taking all the values of both the samples combinely.
Answer 3: An independent measure with exactly two treatments will provide the appropriate research data for Mann - Whitney U test. Option A is correct.
Answer 4: The smaller of the two U values computed from the two samples is Mann - Whitney U value. Option B is correct.
Answer 5: Option A is correct. U = 1
Answer 6: Option B is correct. Ucritical = 5
Answer 7: False, we do not reject the null hypothesis since U > Ucritical.
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