CompTIA Updated DA0-001 Exam Questions and Answers by henryk

Comprehensive and Detailed In-Depth Explanation:

In data analysis, understanding variable types is crucial for accurate data manipulation and interpretation.

Derived Variable: This is a variable created through a mathematical operation on other variables. In this scenario, 'volume' is calculated by multiplying height, width, and depth, making it a derived variable.

Normalized Variable: Normalization involves adjusting values measured on different scales to a common scale, often used in statistical analysis to compare data. This is not applicable to the calculation of volume in this context.

Concatenated Variable: Concatenation refers to linking together two or more strings or character data types. Since volume is a numerical value resulting from multiplication, it is not concatenated.

Aggregated Variable: Aggregation involves summarizing data, such as calculating the sum or average of a dataset. While volume is a result of a calculation, it is not an aggregation of multiple data points but rather a product of specific dimensions.

Therefore, 'volume' in this context is best described as a derived variable, as it is computed from the multiplication of height, width, and depth.

Comprehensive and Detailed In-Depth Explanation:

Themedianis the middle value in a sorted list of numbers. The steps to determine the median are:

Sort the numbers in ascending order:3, 5, 6, 7, 9

Find the middle value:Since there arefivenumbers, the middle value is the third one:Median = 6

Option A (5):Incorrect. 5 is not the middle value.

Option B (6):Correct.6 is the middle value in the sorted list.

Option C (7):Incorrect. 7 is not the middle value.

Option D (9):Incorrect. 9 is the highest value, not the median.