C784 C 784 Exam Latest Update Applied Healthcare

C784 / C 784 Exam ( Update 2025 / 2026) Applied Healthcare Statistics Questions and Answers - WGU

Question:

What display and numerical measure do you use for categorical data to categorical data? (C-->C)

Answer:

Display: 2-way tables

Numerical measure: conditional percentages

Question:

What display and numerical measure do you use for comparing categorical data to quantitative data? (C-->Q)

Answer:

Display: side-by-side boxplots

Numerical measure: 5-numbber summary

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Question:

What display and numerical measure do you use for comparing quantitative data to quantitative data? (Q-->Q)

Answer:

Display: scatterplot

Numerical measure: correlation coefficient

Question:

What is a lurking variable?

Answer:

Not accounted for in the study but affects the value of the response variable

Question:

What is Simpson's paradox?

Answer:

happens when trials don't use the same sample sizes

• individual trial results will be different than total results

EX: if you have 2 trials; trial 1 individual results may show high success rate, and trial 2 individual results will be lower, BUT total results of trial 2 will be higher than trial 1's total results

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Question:

What does regression analysis do?

Answer:

used to describe a trend and make predictions based on KNOWN data (can't use for unknown data)

Question:

What types of data are categorical data?

Answer:

names, labels, categories,

• CANNOT be added, subtracted, or written in (increasing) order

Question:

What charts are used with categorical data?

Answer:

• Pie charts
• Bar charts

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