What does it mean to reject the null hypothesis in a hypothesis test?

The p-value is greater than the significance level

The alternative hypothesis is proven to be true

The data provide sufficient evidence to support the alternative hypothesis

A data scientist is evaluating two classification models for a fraud detection system. Model A has an AUC of 0.92, and Model B has an AUC of 0.88. Which model is better at distinguishing between fraudulent and non-fraudulent transactions?

Model A, because a higher AUC indicates better discrimination ability.

Model A, because it has a higher false positive rate.

Model B, because a lower AUC indicates better discrimination ability.

Model B, because it has a lower false positive rate.

A data scientist is comparing two regression models to predict energy consumption. Model 1 has an AIC of 450, and Model 2 has an AIC of 460. Both models are fitted to the same dataset. Which model should be preferred?

Model 2, because it has a lower R-squared.

Model 1, because a lower AIC indicates a better trade-off between fit and complexity.

Model 2, because a higher AIC indicates a better fit.

Model 1, because it has a higher R-squared.

Which scenario is best suited for applying a t-test?

Comparing the average income across four different regions

Determining if there is a relationship between education level and employment status

Comparing the proportion of males and females in a sample

Comparing the mean blood pressure of patients before and after a treatment

What does entropy measure in information theory?

The amount of uncertainty or disorder in a dataset

The spread of data points around the mean

The correlation between variables

CompTIADataX

Domain 1Objective 1

Statistical Methods DY0-001 Practice Questions (Page 1)

Part of the Mathematics and statistics domain, which accounts for 17% of the DY0-001 exam. CompTIA does not publish an official question count, but from its 165-minute exam (~65–110 total, ~11–19 in this domain), expect 3–5 from this objective — we provide 31 practice questions to prepare you well beyond it. (estimate)

31questions here

7free pages

11concepts

17%of the exam

Questions 1–5

1foundation · easy
What does it mean to reject the null hypothesis in a hypothesis test?
Select an answer first
2application · medium
A data scientist is evaluating two classification models for a fraud detection system. Model A has an AUC of 0.92, and Model B has an AUC of 0.88. Which model is better at distinguishing between fraudulent and non-fraudulent transactions?
Select an answer first
3application · medium
A data scientist is comparing two regression models to predict energy consumption. Model 1 has an AIC of 450, and Model 2 has an AIC of 460. Both models are fitted to the same dataset. Which model should be preferred?
Select an answer first
4foundation · easy
Which scenario is best suited for applying a t-test?
Select an answer first
5foundation · easy
What does entropy measure in information theory?
Select an answer first

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