A clinical trial tests a new drug to reduce blood pressure. The study reports a p-value of 0.03 for the primary outcome, but the effect size is only 1 mmHg reduction. The sample size is 10,000. Which conclusion is most appropriate?

The result is statistically significant but may not be clinically meaningful.

The result is definitely clinically meaningful because p<0.05.

The result is not statistically significant because the effect size is small.

The study is underpowered because the effect size is small.

A data scientist wants to estimate the average height of all adult women in a country. She collects heights from a random sample of 1,000 adult women. What is the population in this scenario?

The set of all possible samples of 1,000 women

The average height of the sample

What does the coefficient of determination (R-squared) measure in a regression model?

The proportion of variance in the dependent variable that is explained by the independent variable(s)

The statistical significance of the regression coefficients

The magnitude of the slope coefficient

The direction of the relationship between variables

A real estate analyst builds a multiple linear regression model to predict house prices using square footage and number of bedrooms. The coefficient for square footage is 150 (p<0.001) and for number of bedrooms is -5,000 (p=0.03). Which interpretation is most appropriate?

Square footage is the only significant predictor because its p-value is smaller.

Holding square footage constant, each additional bedroom is associated with a $5,000 decrease in price.

The model is invalid because a negative coefficient for bedrooms makes no sense.

Each additional bedroom causes a $5,000 decrease in price.

GIAC Machine Learning Engineer

Domain 1Objective 4

Statistics Fundamentals GMLE Practice Questions (Page 1)

Part of the Foundational Data Science and Statistics domain, which makes up ~41% of our current practice bank. GIAC (SANS) does not publish an official question count, but from its 180-minute exam (~70–120 total, ~29–49 in this domain), expect 7–12 from this objective — we provide 49 practice questions to prepare you well beyond it. (estimate)

49questions here

10free pages

10concepts

Questions 1–5

1expert · hard
A clinical trial tests a new drug to reduce blood pressure. The study reports a p-value of 0.03 for the primary outcome, but the effect size is only 1 mmHg reduction. The sample size is 10,000. Which conclusion is most appropriate?
Select an answer first
2foundation · easy
A data scientist wants to estimate the average height of all adult women in a country. She collects heights from a random sample of 1,000 adult women. What is the population in this scenario?
Select an answer first
3foundation · easy
What does the coefficient of determination (R-squared) measure in a regression model?
Select an answer first
4application · medium
A real estate analyst builds a multiple linear regression model to predict house prices using square footage and number of bedrooms. The coefficient for square footage is 150 (p<0.001) and for number of bedrooms is -5,000 (p=0.03). Which interpretation is most appropriate?
Select an answer first
5application · medium
A researcher wants to study the average height of students in a university. They divide the students by major and randomly sample from each major in proportion to the number of students in that major. Which sampling method is being used?
Select an answer first

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