A data analyst is creating a report for a non-technical audience. The analyst needs to show the distribution of monthly sales for the past year, but the data has a few extreme months due to holiday spikes. The analyst wants to highlight the typical monthly sales while also showing the outliers. Which visualization approach is most effective?

A bar chart of average monthly sales

A financial analyst is comparing the risk of two investment portfolios. Portfolio A has a standard deviation of 15%, and Portfolio B has a standard deviation of 10%. Both have the same expected return. What does this indicate?

Both portfolios have the same risk

Portfolio A has a higher expected return

Portfolio B has higher risk than Portfolio A

Portfolio A has higher risk than Portfolio B

CompTIAData+

Domain 3Objective 2

Select Statistical Methods DA0-001 Practice Questions (Page 4)

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 16–20

16expert · hard
A data analyst is creating a report for a non-technical audience. The analyst needs to show the distribution of monthly sales for the past year, but the data has a few extreme months due to holiday spikes. The analyst wants to highlight the typical monthly sales while also showing the outliers. Which visualization approach is most effective?
Select an answer first
17foundation · easy
A call center records the number of customer calls received per hour. The average rate is 10 calls per hour, and the calls occur independently. Which probability distribution is most appropriate to model the number of calls in an hour?
Select an answer first
18application · medium
A financial analyst is comparing the risk of two investment portfolios. Portfolio A has a standard deviation of 15%, and Portfolio B has a standard deviation of 10%. Both have the same expected return. What does this indicate?
Select an answer first
19application · easy
A manufacturer produces light bulbs with a lifespan that is normally distributed with a mean of 1000 hours and a standard deviation of 100 hours. What percentage of bulbs are expected to last between 900 and 1100 hours?
Select an answer first
20application · easy
A market researcher wants to estimate the proportion of customers who are satisfied with a new product. The researcher surveys a random sample of 400 customers and finds that 260 are satisfied. What is the sample proportion of satisfied customers?
Select an answer first

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Select Statistical Methods DA0-001 Practice Questions (Page 4)

Questions 16–20

A call center records the number of customer calls received per hour. The average rate is 10 calls per hour, and the calls occur independently. Which probability distribution is most appropriate to model the number of calls in an hour?

A financial analyst is comparing the risk of two investment portfolios. Portfolio A has a standard deviation of 15%, and Portfolio B has a standard deviation of 10%. Both have the same expected return. What does this indicate?

A manufacturer produces light bulbs with a lifespan that is normally distributed with a mean of 1000 hours and a standard deviation of 100 hours. What percentage of bulbs are expected to last between 900 and 1100 hours?

A market researcher wants to estimate the proportion of customers who are satisfied with a new product. The researcher surveys a random sample of 400 customers and finds that 260 are satisfied. What is the sample proportion of satisfied customers?

Keep studying — Data analysis