A data scientist is testing whether there is a significant linear relationship between years of experience and salary. The scientist fits a linear regression model and obtains a p-value of 0.02 for the slope coefficient. Using a significance level of 0.05, what is the correct conclusion?

The correlation coefficient is zero

The slope is not significantly different from zero; no linear relationship exists

The intercept is significantly different from zero

The slope is significantly different from zero; a linear relationship exists

A website administrator is monitoring the number of server errors per hour. The errors are rare and occur independently. Over the past month, the average rate has been 2 errors per hour. The administrator wants to know the probability of observing 0 errors in the next hour. Which distribution should be used, and what is the probability?

Normal distribution; probability is 0.0228

Exponential distribution; probability is 0.8647

Poisson distribution; probability is 0.1353

Binomial distribution; probability is 0.1353

A political pollster wants to estimate the proportion of voters who support a candidate. The pollster has a budget that allows surveying 1000 voters. To minimize the margin of error, which approach should the pollster take?

Survey voters from a single precinct to ensure consistency

Use a larger sample size than 1000 to reduce the margin of error

Survey only voters who are likely to vote

Use a random sampling method to select the 1000 voters

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Domain 3Objective 2

Select Statistical Methods DA0-001 Practice Questions (Page 2)

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

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Questions 6–10

6application · medium
A data scientist is testing whether there is a significant linear relationship between years of experience and salary. The scientist fits a linear regression model and obtains a p-value of 0.02 for the slope coefficient. Using a significance level of 0.05, what is the correct conclusion?
Select an answer first
7foundation · easy
A data scientist wants to predict a customer's annual spending based on their income. Which statistical technique is most appropriate for this prediction?
Select an answer first
8expert · hard
A website administrator is monitoring the number of server errors per hour. The errors are rare and occur independently. Over the past month, the average rate has been 2 errors per hour. The administrator wants to know the probability of observing 0 errors in the next hour. Which distribution should be used, and what is the probability?
Select an answer first
9foundation · easy
A data analyst calculates a correlation coefficient of -0.85 between the number of hours spent on social media and exam scores. What does this value indicate?
Select an answer first
10expert · hard
A political pollster wants to estimate the proportion of voters who support a candidate. The pollster has a budget that allows surveying 1000 voters. To minimize the margin of error, which approach should the pollster take?
Select an answer first

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Select Statistical Methods DA0-001 Practice Questions (Page 2)

Questions 6–10

A data scientist is testing whether there is a significant linear relationship between years of experience and salary. The scientist fits a linear regression model and obtains a p-value of 0.02 for the slope coefficient. Using a significance level of 0.05, what is the correct conclusion?

A data scientist wants to predict a customer's annual spending based on their income. Which statistical technique is most appropriate for this prediction?

A data analyst calculates a correlation coefficient of -0.85 between the number of hours spent on social media and exam scores. What does this value indicate?

A political pollster wants to estimate the proportion of voters who support a candidate. The pollster has a budget that allows surveying 1000 voters. To minimize the margin of error, which approach should the pollster take?

Keep studying — Data analysis