C 784 C784 Pre-Assessment Review

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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