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Cross-sectional data are data: A.collected over timeB.that are collected over a single period of time C.consisting of a single variableD.consisting of two or more variablesQuestion 2 of 25 4.0 PointsOrdinal data are: A.sorted into categories according to specified characteristicsB.ordered or ranked according to some relationship to one anotherC.ordered, have a specified measure of a distance between observations but have no nature zero D.data which have a natural zeroQuestion 3 of 25 4.0 PointsThe process of collection, organization, and description of data is commonly called: A.descriptive statistics B.statistical inferenceC.predictive statisticsD.operational statistics Question 4 of 25 4.0 Points__________ is a measure of a linear relationship between two variables, X and Y. A.correlationB.rangeC.standard deviation D.medianQuestion 5 of 25 4.0 PointsThe statistical measures that characterize dispersion are: A.Range, variance, standard deviationB.Mean, median, modeC.Range, mean, standard deviationD.Correlation, frequencies, standard deviation Question 6 of 25 4.0 PointsDefine standard deviation A.A measure of how dispersed observations around the mean B.The square root of varianceC.The amount of variation error in the dataD.A & B aboveQuestion 7 of 25 4.0 PointsA discrete random variable is: A.outcomes over a continuous range of real numbers B.a numerical description of the outcome of an experiment C.one for which the number of possible outcomes can be countedD.one for which the number of possible outcomes can not be counted Question 8 of 25 4.0 PointsDefine probability distributions. Describe two common probability distributions.Question 9 of 25 4.0 PointsA confidence interval (CI) is a range of scores with specific boundaries that should contain the ______ mean. A.sampleB.populationC.standard errorD.none of the above Question 10 of 25 4.0 PointsThe most common probabilistic sampling approach is: A.simple random sampling B.convenient samplingC.complex samplingD.error samplingQuestion 11 of 25 4.0 PointsThe hypothesis predicting that differences exist between the groups being compared is to the hypothesis predicting that no differences exist between the groups being compared as _____ hypothesis is to _____ hypothesis. A.null; alternativeB.alternative; nullC.one-tailed; two-tailedD.two-tailed; one tailed Question 12 of 25 4.0 PointsDirectional hypothesis is to non-directional hypothesis as _____ hypothesis is to _____ hypothesis. A.null; alternativeB.alternative; nullC.one-tailed; two-tailedD.two-tailed; one-tailed Question 13 of 25 4.0 PointsA researcher was interested in the emotional effects of music on exam performance. Before their exam, a professor took one group of students into a room in which calming music was played. A different group of students were taken to another room in which new wave hard rock was being played. The students then took the exam and their scores were reported. What type of analysis would be most appropriate? A.Paired (dependent) t-testB.Independent (unpaired) t-testC.Analysis of Variance ANOVAD.Repeated Measures ANOVAQuestion 14 of 25 4.0 PointsAs the value of a t-test _____, the sample variance _____. A.increases; decreasesB.decreases; increasesC.increases; increasesD.decreases; decreasesQuestion 15 of 25 4.0 Points_____ is a procedure which allows us to predict an individual's score on one variable based on knowing one or more other variables. A.Pearson product-moment correlation coefficient B.Coefficient of determinationC.Regression analysesD.Point-biserial correlation coefficientQuestion 16 of 25 4.0 PointsA fashion student was interested in factors that predicted the salaries of catwalk models. She collected data from 231 models. For each model she asked them their salary per day on days when they were working (salary), their age (age), how many years they had worked as a model (years), and then got a panel of experts from modeling agencies to rate the attractiveness of each model as a percentage with 100% being perfectly attractive (beauty). The most appropriate statistical analysis would be: A.T-testB.ANOVAC.Multiple-regressionD.chi squareQuestion 17 of 25 4.0 PointsThe _____ is the best fitting straight-line drawn through the center of a scatterplot that indicates the relationship between the variables. A.regression lineB.negative relationshipC.measure of variationD.multiple-baseline
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