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CompTIA Data+ Certification Exam Sample Questions (Q189-Q194):

NEW QUESTION # 189
A salesperson who is prospecting potential clients collected the following data:

Which of the following is an issue with this data?

A. Missing value
B. Invalid data
C. Duplicate data
D. Redundant data

Answer: A

NEW QUESTION # 190
Which of the following actions should be taken when transmitting data to mitigate the chance of a data leak occurring? (Choose two.)

A. Fata removal
B. Data encryption
C. Data masking
D. Data identification
E. Data reporting
F. Data processing

Answer: B,C

NEW QUESTION # 191
Which of the following techniques should an analyst use to analyze a data set to get a snapshot of basic measures of central tendency?

A. Forecasting
B. Trend analysis
C. Gap analysis
D. Descriptive statistics

Answer: D

Explanation:
Comprehensive and Detailed In-Depth Explanation:
Measures of central tendency are statistical metrics that describe the center point or typical value of a dataset.
The primary measures include mean (average), median (middle value), and mode (most frequent value).
* Descriptive Statistics: This branch of statistics involves summarizing and organizing data to describe its main features. It includes calculating measures of central tendency (mean, median, mode) and measures of dispersion (range, variance, standard deviation). Descriptive statistics provide a comprehensive snapshot of the dataset's characteristics.
* Forecasting: This involves making predictions about future data points based on historical data. While valuable for planning, it doesn't provide insights into the current dataset's central tendency.
* Trend Analysis: This technique examines data over time to identify patterns or trends. It's useful for understanding data direction but doesn't focus on central tendency measures.
* Gap Analysis: This method compares actual performance with potential or desired performance, identifying gaps between current and expected outcomes. It doesn't relate to measures of central tendency.
Therefore, to obtain basic measures of central tendency, an analyst should employ descriptive statistics.

NEW QUESTION # 192
An analyst reviews the following table:

Which of the following data types is represented in the values in the RefNo column?

A. Alphanumeric
B. Currency
C. Real Number
D. Numeric

Answer: D

Explanation:
Comprehensive and Detailed In-Depth
The RefNo column contains values that consist solely of digits without any alphabetical characters or special symbols, indicating a numeric data type.

NEW QUESTION # 193
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.

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

A. LEFT JOIN. four rows
B. OUTER JOIN, seven rows
C. RIGHT JOIN. five rows
D. INNER JOIN, two rows

Answer: A

Explanation:
The correct join the analyst should complete is B. LEFT JOIN, four rows.
A LEFT JOIN is a type of SQL join that returns all the rows from the left table, and the matched rows from the right table. If there is no match, the right table will have null values. A LEFT JOIN is useful when we want to preserve the data from the left table, even if there is no corresponding data in the right table1 Using the example tables, a LEFT JOIN query would look like this:
SELECT t1.Name, t1.City, t2.Age FROM Table1 t1 LEFT JOIN Table2 t2 ON t1.Name = t2.Name; The result of this query would be:
Name City Age Jane Smith Detroit NULL John Smith Dallas 34 Candace Johnson Atlanta 45 Kyle Jacobs Chicago 39 As you can see, the query returns four rows, one for each name in Table1. The name John Smith appears twice in Table2, but only one of them is matched with the name in Table1. The name Jane Smith does not appear in Table2, so the age column has a null value for that row.

NEW QUESTION # 194
......

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Latest DA0-001 Exam Review - 100% Pass DA0-001 - First-grade Reliable CompTIA Data+ Certification Exam Test Syllabus

Reliable DA0-001 Test Syllabus & DA0-001 PDF Download

CompTIA Data+ Certification Exam Sample Questions (Q189-Q194):

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