Distinguishing between sampling risk and control risk differ from detection risk

Sampling risk refers to the fact that, in many instances, the auditor does not examine 100 percent of the class of transactions or account balance. Since only a subset of the population is examined, it is possible that the sample drawn is not representative of the population and a wrong conclusion may be made on the fairness of the account balance. Professional judgment errors (nonsampling risk) occur because an auditor may use an inappropriate audit procedure, fail to detect a misstatement when applying an appropriate audit procedure or misinterpret an audit result.