C 784 / C784 Pre-Assessment Review (Latest Update 2025 / 2026) Applied Healthcare Statistics | Questions and Answers | Grade A | 100% Correct - WGU
Question:
Given a linear relationship between two variables, which correlation coefficient indicates a strong, negative relationship between the two variables?
- −0.9564
- −0.0012
- −1.537
- −5.463
Answer:
The correct answer is a. −0.9564 is correct, because it is the closest value to −1.0 Correlation coefficients are between −1.0and +1.0 so any value less than −1.0s not a valid correlation coefficient.
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Question:
Which scatterplot shows the strongest positive linear relationship between the variables?
a) Graph A
b) Graph B
c) Graph C
d) Graph D
Answer:
The correct answer is a. The points are tightly grouped together, indicating a strong correlation. The points are increasing together, which means the correlation is positive.
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Question:
Use the table below to answer the following question.
What is the joint frequency of successful gamma knife treatments?
- 172
- 239
- 492
- 513
Answer:
The correct answer is d. There was a total of 513 successful gamma knife treatments. The joint frequency for this population is 513
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Question:
Use the table below to answer the following question.
What is the marginal frequency of unsuccessful outcomes?
- 411
- 667
- 752
- 1008
Answer:
The correct answer is a. There was a total of 411 unsuccessful treatments. The marginal frequency for this population is 411
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