20. When working with the different variables methods,(A) difference estimation frequently results in larger sample sizes than any other method.(B) ratio estimation is the method preferred by most auditors since it is simpler to calculate confidence intervals.(C) the difference between the mean-per-unit estimate and the difference estimate is the definition of what is being measured.(D) stratification can only be used with difference estimation.

1. You have been assigned to the audit of NTPU Inc. for the year ended December 31, 2019. Your audit senior has obtained the following files for you to use in your testing, all in Excel format: customer list and accounts receivable December 31. Your customer list file should include the customer number, customer name, complete address, phone number and credit limit. The Accounts Receivable files will each contain the customer number and the accounts receivable balance. How to determine if all customers with a receivable balance are approved customers by ACL? (A) Relate, Choose the accounts receivable table as the primary table and Customer List table as the secondary table. "unmatched primary records". (B) Relate, Choose the Customer List table as the primary table and accounts receivable table as the secondary table. "matched primary records". (C) Join, Choose the accounts receivable table as the primary table and Customer List table as the secondary table. "unmatched primary records". (D) Join. Choose the Customer List table as the primary table and accounts receivable table as the secondary table. "matched primary records".

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