When performing statistical testing, it's essential to understand the potential for mistakes. Specifically, we're talking about Type 1 plus Type 2 failures. A Type 1 failure, sometimes called a false positive, occurs when you wrongly refute a true null statement. Conversely, a Type 2 failure, or missed finding, arises when you cannot to discard a f

SQL's GROUP BY clause|grouping function|aggregation statement} is a powerful tool for summarizing data. It allows you to group rows with the same value in one or more columns into a single row, making it easier to analyze trends and patterns. Visualize you have a table of sales transactions. Using GROUP BY, you could calculate the total revenue for