Which of the following would be an improper technique when using monetary-unit statistical sampling in an audit of accounts receivable?

		Combining negative and positive dollar misstatements in the appraisal of a sample
		Using a sampling technique in which the same account balance could be selected more than once
		Selecting a random starting point and then sampling every nth dollar
		Defining the sampling unit in the population as an individual dollar and not as an individualaccount balance.