Select Statistical Methods DA0-001 Practice Questions (Page 1)

Part of the Data analysis domain, which accounts for 24% of the DA0-001 exam. CompTIA does not publish an official question count, but from its 90-minute exam (~35–60 total, ~8–14 in this domain), expect 3–5 from this objective — we provide 22 practice questions to prepare you well beyond it. (estimate)

22questions here

5free pages

6concepts

24%of the exam

Questions 1–5

1application · medium
A researcher wants to estimate the average height of all adult males in a city. The researcher collects a random sample of 200 adult males and calculates a sample mean of 175 cm with a standard deviation of 8 cm. What is the standard error of the mean?
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2application · easy
A data analyst is reviewing test scores for a class of 20 students. The scores are: 55, 60, 65, 70, 70, 75, 80, 80, 80, 85, 85, 90, 90, 90, 95, 95, 100, 100, 100, 100. The analyst wants to report the most frequently occurring score. Which measure of central tendency should be used?
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3foundation · easy
A quality inspector checks a batch of 20 items and records the number of defective items. Each item has the same probability of being defective, and the items are independent. Which probability distribution should be used to model the number of defective items in the batch?
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4application · medium
An economist is analyzing the relationship between unemployment rate and inflation rate over the past 20 years. The economist wants to visualize the data points and the best-fit line to show the trend. Which type of chart is most appropriate?
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5foundation · easy
A market researcher wants to estimate the average spending of all customers at a large retail chain. They collect data from a random sample of 500 customers. Which statistical method is being used to draw conclusions about the entire customer population?
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Select Statistical Methods DA0-001 Practice Questions (Page 1)

Questions 1–5

A researcher wants to estimate the average height of all adult males in a city. The researcher collects a random sample of 200 adult males and calculates a sample mean of 175 cm with a standard deviation of 8 cm. What is the standard error of the mean?

A data analyst is reviewing test scores for a class of 20 students. The scores are: 55, 60, 65, 70, 70, 75, 80, 80, 80, 85, 85, 90, 90, 90, 95, 95, 100, 100, 100, 100. The analyst wants to report the most frequently occurring score. Which measure of central tendency should be used?

A quality inspector checks a batch of 20 items and records the number of defective items. Each item has the same probability of being defective, and the items are independent. Which probability distribution should be used to model the number of defective items in the batch?

An economist is analyzing the relationship between unemployment rate and inflation rate over the past 20 years. The economist wants to visualize the data points and the best-fit line to show the trend. Which type of chart is most appropriate?

A market researcher wants to estimate the average spending of all customers at a large retail chain. They collect data from a random sample of 500 customers. Which statistical method is being used to draw conclusions about the entire customer population?

Keep studying — Data analysis