問題文
A marketing team has a table of customers with purchase frequency, average basket size, and days since the last order. No label exists. The team wants to know whether natural groups of customers exist so that different messages can be prepared for each group. Which option correctly identifies the two statements that are true of this work? (Select two.)
選択肢
- The number of groups is a choice the team has to make and justify, because the data does not contain the answer.
- It is supervised learning, because the three input columns act as labels for one another.
- It is unsupervised learning, because no column in the table states which group a customer belongs to.
- The result can be evaluated with a confusion matrix, because each customer is assigned to exactly one group.
- The three columns must be left on their original scales, because rescaling them would change which customers belong together.