CHAPTER 7—SAMPLING AND SAMPLING DISTRIBUTIONSMULTIPLE CHOICE1.From a group of 12 students, we want to select a random sample of 4 students to serve on a university committee. How many combination of random samples of 4 students can be selected?a.48b.20,736c.16d.495ANS: DPTS:1TOP:Sampling2.Parameters area.numerical characteristics of a sampleb.numerical characteristics of a populationc.the averages taken from a sampled.numerical characteristics of either a sample or a populationANS: BPTS:1TOP:Sampling3.How many simple random samples of size 3 can be selected from a population of size 7?a.7b.21c.35d.343ANS: CPTS:1TOP:Sampling4.How many simple random samples of size 5 can be selected from a population of size 8?a.40b.68c.336d.56ANS: DPTS:1TOP:Sampling5.Sampling distribution of is thea.probability distribution of the sample meanb.probability distribution of the sample proportionc.mean of the sampled.mean of the populationANS:APTS:1TOP:Sampling Distribution6.A simple random sample of 100 observations was taken from a large population. The sample mean andthe standard deviation were determined to be 80 and 12 respectively. The standard error of the mean isa.1.20b.0.12c.8.00d.0.80ANS: APTS:1TOP:Inference

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7.A simple random sample of 144 observations was taken from a large population. The sample mean andthe standard deviation were determined to be 1234 and 120 respectively. The standard error of the mean isa.1234±120b.120c.120*12=1440d.10ANS: DPTS:1TOP:Inference8.A population has a standard deviation of 16. If a sample of size 64 is selected from this population, what is the probability that the sample mean will be within ±2 of the population mean?a.0.6826b.0.3413c.-0.6826d.Since the mean is not given, there is no answer to this question.ANS: APTS:1TOP:Inference9.The probability distribution of all possible values of the sample proportion is thea.probability density function of b.sampling distribution of c.same as , since it considers all possible values of the sample proportiond.sampling distribution of ANS:DPTS:1TOP:Sampling Distribution10.In computing the standard error of the mean, the finite population correction factor is used whena.N/n > 0.05b.N/n 0.05c.n/N > 0.05d.n/N 30ANS: CPTS:1TOP:Sampling11.Convenience sampling is an example ofa.probabilistic samplingb.stratified samplingc.nonprobabilistic samplingd.cluster samplingANS: CPTS:1TOP:Sampling