ARKANSAS DATA ANALYTICS SPECIALIST
EXAM WITH QUESTIONS AND CORRECT
ANSWERS AND RATIONALES LATEST 2026-2027
UPDATE
Questions 1–70
1. Which measure of central tendency is least affected by extreme
outliers?
A. Mean
B. Median
C. Variance
D. Standard deviation
Correct Answer: B. Median
Rationale: The median represents the middle observation and is
relatively resistant to extreme values, whereas the mean can be
substantially distorted by outliers.
2. What is the primary purpose of data cleaning?
A. Increase the size of a dataset
B. Remove or correct inaccurate, incomplete, or inconsistent data
C. Create charts automatically
D. Encrypt all data
Correct Answer: B. Remove or correct inaccurate, incomplete, or
inconsistent data
Rationale: Data cleaning improves data quality by identifying and
correcting errors, duplicates, missing values, inconsistent formats, and
other problems.
,3. Which SQL command is used to retrieve data from a database?
A. INSERT
B. UPDATE
C. SELECT
D. DELETE
Correct Answer: C. SELECT
Rationale: SELECT retrieves records from one or more database tables.
4. In statistics, what does a p-value help determine?
A. The size of a dataset
B. The probability of observing results at least as extreme as those
obtained, assuming the null hypothesis is true
C. The number of missing observations
D. The correlation coefficient
Correct Answer: B. The probability of observing results at least as
extreme as those obtained, assuming the null hypothesis is true
Rationale: A p-value provides evidence against the null hypothesis. A
sufficiently small p-value may lead researchers to reject the null
hypothesis.
5. Which visualization is generally most appropriate for showing a
trend over time?
A. Pie chart
B. Line chart
, C. Histogram
D. Box plot
Correct Answer: B. Line chart
Rationale: Line charts effectively display changes and trends across
sequential time periods.
6. What does normalization generally accomplish in a relational
database?
A. Increases duplicate information
B. Reduces unnecessary data redundancy
C. Deletes all historical data
D. Converts numerical data to text
Correct Answer: B. Reduces unnecessary data redundancy
Rationale: Database normalization organizes data into related tables to
minimize redundancy and improve data integrity.
7. Which Python library is commonly used for data manipulation
and analysis?
A. Pandas
B. Flask
C. Django
D. Requests
Correct Answer: A. Pandas
Rationale: Pandas provides DataFrame and Series structures and
numerous functions for cleaning, transforming, aggregating, and
analyzing data.
EXAM WITH QUESTIONS AND CORRECT
ANSWERS AND RATIONALES LATEST 2026-2027
UPDATE
Questions 1–70
1. Which measure of central tendency is least affected by extreme
outliers?
A. Mean
B. Median
C. Variance
D. Standard deviation
Correct Answer: B. Median
Rationale: The median represents the middle observation and is
relatively resistant to extreme values, whereas the mean can be
substantially distorted by outliers.
2. What is the primary purpose of data cleaning?
A. Increase the size of a dataset
B. Remove or correct inaccurate, incomplete, or inconsistent data
C. Create charts automatically
D. Encrypt all data
Correct Answer: B. Remove or correct inaccurate, incomplete, or
inconsistent data
Rationale: Data cleaning improves data quality by identifying and
correcting errors, duplicates, missing values, inconsistent formats, and
other problems.
,3. Which SQL command is used to retrieve data from a database?
A. INSERT
B. UPDATE
C. SELECT
D. DELETE
Correct Answer: C. SELECT
Rationale: SELECT retrieves records from one or more database tables.
4. In statistics, what does a p-value help determine?
A. The size of a dataset
B. The probability of observing results at least as extreme as those
obtained, assuming the null hypothesis is true
C. The number of missing observations
D. The correlation coefficient
Correct Answer: B. The probability of observing results at least as
extreme as those obtained, assuming the null hypothesis is true
Rationale: A p-value provides evidence against the null hypothesis. A
sufficiently small p-value may lead researchers to reject the null
hypothesis.
5. Which visualization is generally most appropriate for showing a
trend over time?
A. Pie chart
B. Line chart
, C. Histogram
D. Box plot
Correct Answer: B. Line chart
Rationale: Line charts effectively display changes and trends across
sequential time periods.
6. What does normalization generally accomplish in a relational
database?
A. Increases duplicate information
B. Reduces unnecessary data redundancy
C. Deletes all historical data
D. Converts numerical data to text
Correct Answer: B. Reduces unnecessary data redundancy
Rationale: Database normalization organizes data into related tables to
minimize redundancy and improve data integrity.
7. Which Python library is commonly used for data manipulation
and analysis?
A. Pandas
B. Flask
C. Django
D. Requests
Correct Answer: A. Pandas
Rationale: Pandas provides DataFrame and Series structures and
numerous functions for cleaning, transforming, aggregating, and
analyzing data.
