A5 Flashcards
Only area where auditor does not use judgment in sampling
*deciding which items will be selected
Sampling Risk
*risk that the sample is not representative of the population and that the auditor’s conclusion will be different as a result
Statistical vs. Nonstatistical Sampling
nonstatistical chooses sample size judgmentally
Does statistical sampling eliminate the need for auditing judgment?
No
Types of sampling
attribute sampling - I/C
variables sampling - substantive work
*attributes can usually be answered yes or no
Sampling Risks in Substantive Testing
- Risk of Incorrect Acceptance (Beta) (Effectiveness)
2. Risk of Incorrect Rejection (Alpha) (Efficiency)
Sampling Risks in Tests of Controls
- Risk of Assessing Control Risk too Low (Beta) (Effectiveness)
- Risk of Assessing Control Risk too High (Alpha) (Efficiency)
Beta risk is inversely related to
the confidence interval
Types of nonsampling risk
- use inappropriate audit evidence
2. improperly evaluate the results
What is used to determine whether or not a sample of internal controls can be accepted?
the UPPER DEVIATION RATE
= sample deviation rate + allowance for sampling risk
Formula for upper deviation rate
= sample deviation rate + allowance for sampling risk
Does population size have a large impact on sample size?
No
I/C: Inversely Related to Sample Size
- risk of assessing control risk too low
2. tolerable deviation rate
I/C: Directly Related to Sample Size
- expected deviation rate
Is block (cluster) sampling allowed?
No
UDR <= TDR
accept
UDR > TDR
reject
Discovery sampling
once you find one instance you reject
*used with fraud/critical items
When to use stratification
- when a population has highly variable recorded amounts
* results in a reduced sample size
Three Types of Sampling Plans
- mean-per-unit
- ratio estimation
- difference estimation
Mean-Per-Unit
- misstatement per item selected X population
2. 1 standard deviation X population
Ratio Estimation
audited amount / recorded amount X population recorded amount
Difference Estimation
recorded amount - audited amount / sample size X population size
What is a sampling unit?
*one account, dollar, etc.
Direct Relationship for Sample Size for Substantive
- expected misstatement
- standard deviation
- assessed level of risk
Inverse Relationship for Sample Size for Substantive
- tolerable misstatement
2. acceptable level of risk