Simple random sampling uses a sample of size n from a population of size N to obtain data that canbe used to make inferences about the characteristics of a population. Suppose that, from apopulation of 50 bank accounts, we want to take a random sample of four accounts in order tolearn about the population. How many different random samples of four accounts are possible?(Hint: Is this question about permutation or combination?) The National Occupant Protection Use Survey (NOPUS) was conducted to provide probability-based data on motorcycle helmet use in the United States. The survey was conducted by sendingobservers to randomly selected roadway sites where they collected data on motorcycle helmet use,including the number of motorcyclists wearing a Department of Transportation (DOT)-complianthelmet (National Highway Traffic Safety Administration website, January 7, 2010). Sample dataconsistent with the most recent NOPUS are shown below. Answer questions 8 -10.Type of HelmetDOT-RegionCompliantNoncompliantNortheast9662Midwest8643South9249West7616Total350170(Hint: The above table is a cross-tabulation, but the right margin is missing. You will need tocalculate the total number of motorcyclists for each region as well as the total number ofmotorcyclists of all four regions.)

Simple random sampling uses a sample of size n from a population of size N to obtain data that car be used to make inferences about the characteristics of a population. Suppose that, from a population of 50 bank accounts, we want to take a random sample of four accounts in order to learn about the population. How many different random samples of four accounts are possible? (Hint: Is this question about permutation or combination?)