CompTIA Data+ DA0-002 (V2) Practice Question

The correct answer is to create a derived variable, also known as a calculated field. This technique involves creating a new column by applying a formula or a set of rules to existing columns. In this scenario, a conditional statement (like a CASE statement in SQL) would be used to check if HoursWorked is greater than 40 and then apply the appropriate calculation for regular pay and overtime pay to derive the GrossPay for each row.

• Binning is incorrect because it is used to group a range of continuous values into a smaller number of 'bins' or categories. It would be useful for grouping employees by hours worked (e.g., '0-20', '21-40', '41+'), but not for calculating their specific pay.
• Using an aggregate function is incorrect. Aggregate functions like SUM() or AVG() operate on multiple rows to return a single summary value. This task requires a new value to be calculated for each individual employee row, not a summary of the entire dataset.
• Imputation is incorrect because it is a technique used to fill in missing values in a dataset. The scenario does not state that there is any missing data to be handled; rather, it requires the creation of new data from existing values.