Sample Selection Method

Question 1

Sample selection method

Answer 1

According to ISA 530, the population is the entire set of data from which a sample is selected and about which the auditor wishes to draw conclusions. The population must be appropriate for the audit objective and complete, meaning all relevant items must be included.

Example:
- If the audit objective is to confirm the accuracy of trade receivable balances, the population should include all trade receivables as of a specified date.
- If the objective is to confirm the accuracy of trade receivables over Rs.500,000, the population should consist of all receivables balances over Rs.500,000.

ISA 530 requires auditors to select a sample so that each item in the population has an equal chance of being selected. Here are some common sample selection methods:

1. Random Sampling:
   
   • Definition: Every item in the population has an equal chance of selection.
   • Example: Using random numbers to select invoices for testing.
2. Systematic Sampling:
   
   • Definition: A random starting point is chosen, and items are selected at regular intervals.
   • Example: Selecting every 10th invoice from a list after choosing a random starting point.
3. Haphazard Sampling:
   
   • Definition: The auditor selects the sample arbitrarily.
   • Example: Choosing any 100 invoices from a file without a specific method.
   • Note: This method is not scientifically valid and may introduce bias, making it unsuitable for statistical sampling.
4. Block Sampling:
   
   • Definition: The auditor selects a complete block of sampling units.
   • Example: Selecting all invoices from the month of May.

Scenario: An auditor is auditing a company’s sales transactions.

Steps:
1. Define Population: Identify all sales transactions for the year.
2. Choose Sampling Method:
- Random Sampling: Use random numbers to select sales invoices.
- Systematic Sampling: Select every 20th invoice after a random start.
- Haphazard Sampling: Arbitrarily choose 50 invoices (not recommended for statistical sampling).
- Block Sampling: Select all invoices from a specific month.

By carefully defining the population and selecting an appropriate sampling method, auditors can effectively gather sufficient and appropriate audit evidence. If you have any further questions or need more detailed examples, feel free to ask!

Question 2

Sample selection method

Answer 2

According to ISA 530, the population is the entire set of data from which a sample is selected and about which the auditor wishes to draw conclusions. The population must be appropriate for the audit objective and complete, meaning all relevant items must be included.

Example:
- If the audit objective is to confirm the accuracy of trade receivable balances, the population should include all trade receivables as of a specified date.
- If the objective is to confirm the accuracy of trade receivables over Rs.500,000, the population should consist of all receivables balances over Rs.500,000.

ISA 530 requires auditors to select a sample so that each item in the population has an equal chance of being selected. Here are some common sample selection methods:

1. Random Sampling:
   
   • Definition: Every item in the population has an equal chance of selection.
   • Example: Using random numbers to select invoices for testing.
2. Systematic Sampling:
   
   • Definition: A random starting point is chosen, and items are selected at regular intervals.
   • Example: Selecting every 10th invoice from a list after choosing a random starting point.
3. Haphazard Sampling:
   
   • Definition: The auditor selects the sample arbitrarily.
   • Example: Choosing any 100 invoices from a file without a specific method.
   • Note: This method is not scientifically valid and may introduce bias, making it unsuitable for statistical sampling.
4. Block Sampling:
   
   • Definition: The auditor selects a complete block of sampling units.
   • Example: Selecting all invoices from the month of May.

Scenario: An auditor is auditing a company’s sales transactions.

Steps:
1. Define Population: Identify all sales transactions for the year.
2. Choose Sampling Method:
- Random Sampling: Use random numbers to select sales invoices.
- Systematic Sampling: Select every 20th invoice after a random start.
- Haphazard Sampling: Arbitrarily choose 50 invoices (not recommended for statistical sampling).
- Block Sampling: Select all invoices from a specific month.

By carefully defining the population and selecting an appropriate sampling method, auditors can effectively gather sufficient and appropriate audit evidence. If you have any further questions or need more detailed examples, feel free to ask!