1 The bank may not pay from the customer's account without a mandate from the customer, e.g. a cheque drawn by the customer.  The bank agrees to promptly collect the cheques deposited to the customer's account as the customer's agent, and to credit the proceeds to the customer's account.
Population vs Sample. The main difference between a population and sample has to do with how observations are assigned to the data set. 1  A population includes all of the elements from a set of data.  A sample consists of one or more observations from the population.
Understanding sample sizes. Population size: The total number of people in the group you are trying to reach with your survey is called your population size. If you were taking a random sample of people across the United States, then your population size would be about 317 million.