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Free PDF Quiz Trustable DA0-001 - Vce CompTIA Data+ Certification Exam Exam

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CompTIA Data+ Certification Exam Sample Questions (Q154-Q159):

NEW QUESTION # 154
Which of the following activities occurs during the ETL process?

A. Reviewing and addressing missing values
B. Multiplying unique data
C. Creating a dashboard
D. Inserting a pivot table and pivot chart

Answer: A

Explanation:
Comprehensive and Detailed In-Depth
ETL stands for Extract, Transform, Load, which are the three fundamental steps in the data integration process:
Extract:Retrieving data from various source systems.
Transform:Cleaning and converting the extracted data into a suitable format or structure for analysis.
Load:Inserting the transformed data into a target database or data warehouse.
Option A:Reviewing and addressing missing values
Rationale:During theTransformphase of the ETL process, data is cleansed and prepared for analysis. This includes reviewing and addressing missing values to ensure data quality and consistency. Handling missing data is crucial, as it can impact the accuracy of analyses and decision-making.
Reference:
comptia.org
Option B:Creating a dashboard
Rationale:Creating a dashboard is part of data visualization and reporting, which occurs after the ETL process has been completed. Dashboards are tools used to present data insights and are not involved in the extraction, transformation, or loading of data.
Option C:Inserting a pivot table and pivot chart
Rationale:Inserting pivot tables and pivot charts is an analytical activity performed on processed data, typically after the ETL process. These tools help in summarizing and analyzing data but are not part of the ETL stages.
Option D:Multiplying unique data
Rationale:This option is ambiguous and does not correspond to any standard activity within the ETL process.

NEW QUESTION # 155
A customer survey reveals 90% positive feedback. Which of the following statistical methods would be best to utilize to determine the reliability of a data set and predict how a larger sample of customers over the same time period might respond?

A. Calculate a high variance on survey responses.
B. Calculate a low standard deviation on survey responses.
C. Remove any data more than 4 standard deviation from the mean.
D. Calculate the maximum range of the survey responses.

Answer: B

Explanation:
A low standard deviation in survey responses indicates that the data points tend to be close to the mean, suggesting a high level of consistency among the responses. This consistency is crucial for determining the reliability of the data set and predicting future outcomes. If the standard deviation is low, it means that the positive feedback is not only high but also consistent, making it a reliable indicator of customer satisfaction and a good predictor of how a larger sample might respond.
References: The concept of using standard deviation to assess data reliability is a standard practice in statistics and data analysis123.

NEW QUESTION # 156
Which of the following value is the measure of dispersion "range" between the scores of ten students in a test.
The scores of ten students in a test are 17, 23, 30, 36, 45, 51, 58, 66, 72, 77.

A. 0
B. 1
C. 2
D. 3

Answer: C

Explanation:
Explanation
The correct answer is: 60
Range is the interval between the highest and the lowest score.
Range is a measure of variability or scatteredness of the varieties or observations among themselves and does not give an idea about the spread of the observations around some central value.
Symbolically R = Hs - Ls.
Where R = Range; Hs is the 'Highest score' and Ls is the Lowest Score.
The scores of ten students in a test are: 17, 23, 30, 36, 45, 51, 58, 66, 72, 77.
The highest score is 77 and the lowest score is 17.
So the range is the difference between these two scores Range = 77 - 17 = 60

NEW QUESTION # 157
A data analyst was asked to create a chart that shows the relationship between study hours and exam scores for each student using the data sets in the table below:

Which of the following charts would BEST represent the relationship between the variables?

A. A heat map
B. A bar chart
C. A histogram
D. A scatter plot

Answer: D

NEW QUESTION # 158
A collections manager has a team calling customers who are past due on their accounts in an attempt to collect payments. The manager receives the call list in the form of a printed report that is generated by the accounting department at the beginning of each week. Consequently, the collections team calls some customers who have made payments in the time since the report was last printed. Which of the following reporting enhancements could the accounting department implement to best reduce the number of calls on current accounts?

A. Increase the frequency of report generation.
B. Add a report run date to the report.
C. Include a time stamp on the report.
D. Modify the date range on the report

Answer: A

Explanation:
The best reporting enhancement that the accounting department could implement to reduce the number of calls on current accounts is C. Increase the frequency of report generation.
By increasing the frequency of report generation, the accounting department could provide the collections manager with more up-to-date information on the customers who are past due on their accounts. This would help to avoid calling customers who have made payments in the time since the last report was printed, and thus reduce the number of calls on current accounts. Increasing the frequency of report generation would also improve the accuracy and timeliness of the data, and enhance the efficiency and effectiveness of the collections process.
Modifying the date range on the report, including a time stamp on the report, or adding a report run date to the report would not be sufficient to reduce the number of calls on current accounts. These enhancements would only provide information on when the report was generated or what period it covers, but they would not change the fact that the report could be outdated by the time it reaches the collections manager. Therefore, these enhancements would not solve the problem of calling customers who have already paid their accounts.

NEW QUESTION # 159
......

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