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DA0-001 Practice Questions

CompTIA Data+ Certification Exam

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Total Questions : 396

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Question # 31

Which one of the following values will appear first if they are sorted in descending order?

Options:

A.  

Aaron.

B.  

Molly.

C.  

Xavier.

D.  

Adam.

Discussion 0
Question # 32

An analyst needs to join two tables of data together for analysis. All the names and cities in the first table should be joined with the corresponding ages in the second table, if applicable.

Question # 32

Which of the following is the correct join the analyst should complete. and how many total rows will be in one table?

Options:

A.  

INNER JOIN, two rows

B.  

LEFT JOIN. four rows

C.  

RIGHT JOIN. five rows

D.  

OUTER JOIN, seven rows

Discussion 0
Question # 33

Joseph is interpreting a left skewed distribution of test scores. Joe scored at the mean, Alfonso scored at the median, and gaby scored and the end of the tail.

Who had the highest score?

Options:

A.  

Joseph

B.  

Joe

C.  

Alfonso

D.  

Gaby

Discussion 0
Question # 34

An analyst is preparing a report that contains weather data. The temperatures are shown in Fahrenheit. but they must be reported in Celsius. Which of the following should the analyst do to fix this issue?

Options:

A.  

Normalize the data.

B.  

Standardize the data.

C.  

Rescale the data.

D.  

Aggregate the data.

Discussion 0
Question # 35

Q3 2020 has just ended, and now a data analyst needs to create an ad-hoc sales report that demonstrates how well the Q3 2020 promotion went versus last year's Q3 promotion.

Which of the following date parameters should the analyst use?

Options:

A.  

2019 vs. YTD 2020

B.  

Q3 2019 vs. Q3 2020

C.  

YTD 2019 vs. YTD 2020

D.  

Q4 2019 vs. Q3 2020

Discussion 0
Question # 36

Which of the following should be accomplished NEXT after understanding a business requirement for a data analysis report?

Options:

A.  

Rephrase the business requirement.

B.  

Determine the data necessary for the analysis

C.  

Build a mock dashboard/presentation layout.

D.  

Perform exploratory data analysis.

Discussion 0
Question # 37

Which of the following best describes a 95% confidence interval?

Options:

A.  

There is a 95% probability that a sample is within one standard deviation of the mean.

B.  

A stated range may contain 95% of the population mean, 95% of the time.

C.  

A set of ranges contains the population mean with 95% certainty.

D.  

A range contains 95% of the population mean.

Discussion 0
Question # 38

A gambler thinks that a coin is fair and is equally likely to turn up heads or tails when the coin is flipped. Which of the following tests should the gambler use to fest this hypothesis?

Options:

A.  

t-test

B.  

Chi-squared test

C.  

Rank sum test

D.  

Ratio test

Discussion 0
Question # 39

An analyst is designing a dashboard to determine which site has the highest percentage of new customers. The analyst must choose an appropriate chart to include in the dashboard. The following data is available:

Question # 39

Which of the following types of charts should be considered to best display the data?

Options:

A.  

Include a bar chart using the site and the percentage of new customers data.

B.  

Include a line chart using the site and the percentage of new customers data.

C.  

Include a pie chart using the site and percentage of new custorners data.

D.  

Include a scatter chart using the site and the percent of new customers data.

Discussion 0
Question # 40

An analyst needs to summarize the number of people in Chicago in 2022 using the following set of data:

Question # 40

Which of the following steps should the analyst use to provide results? (Select two).

Options:

A.  

Aggregation

B.  

Sorting

C.  

Filtering

D.  

Indexing

E.  

Cleaning

F.  

Replacing

Discussion 0
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