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MBA 522 -Data Analysis for Effective Decision Making -Mid term Exam

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Question;INSTRUCTIONS: For questions 1 through 50, choose the most correct answer. Transfer your answer tothe answer sheet when done.1.In a questionnaire, respondents are asked to mark their gender as male or female. Gender is anexample of thea.nominal scaleb.ordinal scalec.interval scaled.ratio scale2.Thea.b.c.d.3.Celsius temperature (C?) is an example of a variable that usesa.the ordinal scaleb.the interval scalec.the ratio scaled.either the ratio or the ordinal scale4.Income after taxes is an example of a variable that uses thea.nominal scaleb.ordinal scalec.interval scaled.ratio scale5.Thea.b.c.d.6.Quantitative dataa.are always nonnumericb.may be either numeric or nonnumericc.are always numericd.None of these alternatives is correct.7.In a questionnaire, respondents are asked to mark their gender as male or female. Gender is anexample of aa.qualitative variableb.quantitative variablec.qualitative or quantitative variable, depending on how the respondents answered thequestiond.None of these alternatives is correct.8.Qualitative dataa.must be numericb.must be nonnumericc.cannot be numericd.may be either numeric or nonnumericscale of measurement that is used to rank order the observation for a variable is called thenominal scaleordinal scaleinterval scaleratio scaleentities on which data are collected areelementspopulationssamplesNone of these alternatives is correct.? page 1 of 7 ?MBA 522 ?Data Analysis for Effective Decision Making?Mid-Term Exam ? Section I (Multiple Choice)(Summer 2010, Classroom)9.Dataa.b.c.d.collected over several time periods aretime series datatime controlled datacrossectional datatime crossectional data10.A portion of the population selected to represent the population is calleda.statistical inferenceb.descriptive statisticsc.a censusd.a sample11.A situation in which conclusions based upon aggregated crosstabulation are different fromunaggregated crosstabulation is known asa.wrong crosstabulationb.Empirical rulec.Simpson?s Paradoxd.aggregated crosstabulation12.Thea.b.c.d.13.When a histogram has a longer tail to the right, it is said to bea.symmetricalb.skewed to the leftc.skewed to the rightd.None of these alternatives is correct.14.Bayes? theorem is used to computea.the prior probabilitiesb.the union of eventsc.intersection of eventsd.the posterior probabilities15.Which of the following provides a measure of central location for the data?a.standard deviationb.meanc.varianced.range16.A numerical value used as a summary measure for a sample, such as sample mean, is known asa.a population parameterb.a sample parameterc.a sample statisticd.a population meansum of the relative frequencies for all classes will always equalthe sample sizethe number of classes1any value larger than one? page 2 of 7 ?MBA 522 ?Data Analysis for Effective Decision Making?Mid-Term Exam ? Section I (Multiple Choice)(Summer 2010, Classroom)17.Thea.b.c.d.pth percentile is a value such that at least p percent of the observations areless than or equal to this valueless than this valuemore than or equal to this valuemore than this value18.Thea.b.c.d.difference between the largest and the smallest data values is thevarianceinterquartile range (IQR)rangecoefficient of variation19.Thethea.b.c.d.value which has half of the observations above it and half the observations below it is called20.Thea.b.c.d.most frequently occurring value of a data set is called therangemeanmedianmode21.The interquartile range (IQR) is used as a measure of variability to overcome what difficulty ofthe range?a.the sum of the range variances is 0b.the range is difficult to computec.the range is influenced too much by extreme valuesd.the range is negative22.The measure of location which is the most likely to be influenced by extreme values in the dataset is thea.rangeb.meanc.mediand.mode23.Thea.b.c.d.24.Positive values of covariance indicatea positive variance of the x valuesa.a positive variance of the y valuesb.c.the standard deviation is positived.a positive relation between the independent and the dependent variablesrangemeanmedianmodenumerical value of the standard deviation can never belarger than the variance0negativesmaller than the variance? page 3 of 7 ?MBA 522 ?Data Analysis for Effective Decision Making?Mid-Term Exam ? Section I (Multiple Choice)(Summer 2010, Classroom)25.A numerical measure of linear association between two variables is thea.varianceb.coefficient of variationc.correlation coefficientd.standard deviation26.Thea.b.c.d.27.The counting rule that is used for counting the number of experimental outcomes when n objectsare selected from a set of N objects where order of selection is not important is calleda.permutationb.combinationc.multiple step experimentd.None of these alternatives is correct.28.The counting rule that is used for counting the number of experimental outcomes when n objectsare selected from a set of N objects where order of selection is important is calleda.permutationb.combinationc.multiple step experimentd.None of these alternatives is correct.29.In statistical experiments, each time the experiment is repeateda.the same outcome must occurb.the same outcome can not occur againc.a different outcome may occurd.a different out come must occur30.When the assumption of equally likely outcomes is used to assign probability values, the methodused to assign probabilities is referred to as thea.classical methodb.relative frequency methodc.subjective methodd.probability method31.When the results of experimentation or historical data are used to assign probability values, themethod used to assign probabilities is referred to as thea.classical methodb.relative frequency methodc.subjective methodd.probability method32.A method of assigning probabilities based upon judgment is referred to as thea.classical methodb.relative frequency methodc.subjective methodd.probability methodcorrelation coefficient ranges between0 and 1-1 and +1- and +1 and 100? page 4 of 7 ?MBA 522 ?Data Analysis for Effective Decision Making?Mid-Term Exam ? Section I (Multiple Choice)(Summer 2010, Classroom)33.If two events are independent, thena.they must be mutually exclusiveb.the sum of their probabilities must be equal to onec.their intersection must be zerod.None of these alternatives is correct.34.Twoa.b.c.d.events are mutually exclusiveif their intersection is 1if they have no sample points in commonif their intersection is 0.5None of these alternatives is correct.35.Thea.b.c.d.range of probability isany value larger than zeroany value between - to +0 to 1any value between -1 to 136.Which of the following statements is always true?-1 P(Ei) 1a.b.P(A) = 1 - P(Ac)c.P(A) + P(B) = 1d.?P(Ei) 137.Thea.b.c.d.38.Events A and B are mutually exclusive. Which of the following statements is also true?a.A and B are also independentb.P(A? B) = P(A)?P(B)c.P(A? B) = P(A) + P(B)d.P(A? B) = P(A) + P(B)39.A perfectly balanced coin is tossed six times and tails appears on all six tosses. Then, on theseventh triala.tails can not appearb.heads has a larger chance of appearing than tailsc.tails has a better chance of appearing than headsd.None of these alternatives is correct.40.A random variable that can assume only a finite number of values is referred to as a(n)a.infinite sequenceb.finite sequencec.discrete random variabled.discrete probability functionunion of events A and B is the event containingall the sample points belonging to A or Ball the sample points belonging to B or Aall the sample points belonging to A or B or bothall the sample points belonging to A or B, but not both? page 5 of 7 ?MBA 522 ?Data Analysis for Effective Decision Making?Mid-Term Exam ? Section I (Multiple Choice)(Summer 2010, Classroom)41.Which of the following is a required condition for a discrete probability function?a.?f(x) = 0f(x) 1 for all values of xb.f(x) < 0c.d.f(x) = 142.Thea.b.c.d.number of customers that enter a store during one day is an example ofa continuous random variablea discrete random variableeither a continuous or a discrete random variable, depending on the number of thecustomerseither a continuous or a discrete random variable, depending on the gender of thecustomers43.Thea.b.c.d.mass of a stone is an example ofa continuous random variablea discrete random variableeither a continuous or a discrete random variable, depending on the mass of the stoneeither a continuous or a discrete random variable depending on the units of measurement44.If you are conducting an experiment where the probability of a success is 0.02 and you areinterested in the probability of 12 successes in 15 trials, the correct probability function to use isthea.standard normal probability density functionb.normal probability density functionc.Poisson probability functiond.binomial probability function45.In the textile industry, a manufacturer is interested in the number of blemishes or flaws occurringin each 100 feet of material. The probability distribution that has the greatest chance of applyingto this situation is thea.normal distributionb.binomial distributionc.Poisson distributiond.uniform distribution46.Thea.b.c.d.47.In a binomial experimenta.the probability does not change from trial to trialb.the probability does change from trial to trialc.the probability could change from trial to trial, depending on the situation underconsiderationd.None of these alternatives is correct.binomial probability distribution is used witha continuous random variablea discrete random variableany distribution, as long as it is not normalNone of these alternatives is correct.? page 6 of 7 ?MBA 522 ?Data Analysis for Effective Decision Making?Mid-Term Exam ? Section I (Multiple Choice)48.Thea.b.c.d.Empirical Rule can be used forany distributiononly a normal distributiona distribution without outliersonly a distribution with outliers49.Chebyshev?s Therom can be used fora.any distributionb.only a normal distributionc.a distribution without outliersd.only a distribution with outliers50.An outlier can be detected bya z-score less than -3.0 or greater than +3.0a.b.being less than Q1 ? 1.5(IQR) or greater than Q3 + 1.5(IQR)c.Either of the above alternatives is correct.d.None of these alternatives is correct.

 

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