Exam 15: Testing for Differences Between Groups and for Predictive Relationships

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When the difference between two groups is measured, bivariate statistics are used.

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____________________ in regression analysis refers to how strongly interrelated the independent variables in a model are.

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Which analysis is portrayed by the equation: Y = bo + β\beta 1X1 + β\beta 2X2 + β\beta 3X3...+ β\beta nXn?

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In using the Z-test for comparing two proportions, the null hypothesis is typically stated as ____.

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The degrees of freedom are calculated as df = n - 1 when using the t-test for comparing two means, where n = n1 + n2.

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The independent samples t-test tests the differences between means from no more than four independent samples or groups.

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Once a variable has more than four categories, a cross-tabulation table has a stronger advantage in its simplicity in communicating the result.

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The chi-square test tests the significance of the relationship shown in an R X C contingency table in which R stands for row and C stands for column.

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Choosing the right statistic boils down to what type and how many variables are involved in a particular research question or hypothesis.

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In the regression equation, Y = a + β\beta X , β\beta is the ____.

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The null hypothesis for an ANOVA test comparing the means of three groups is: μ\mu 1 = μ\mu 2 = μ\mu 3.

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In a regression equation, the beta coefficients indicate the effect on the dependent variable of a 1-unit increase in any of the independent variables.

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Suppose that you are using a 9-point rating scale to compare men who have an annual income over $50, 000 (Group 1)with men who have an annual income less than or equal to $50, 000 (Group 2)with regard to their assessment of a new product.There are forty men in Group 1 and they have a mean of 7 and a standard deviation of 2.5, while the 35 men in Group 2 have a mean of 5 and a standard deviation of 1.4.What is the approximate value of t using the t-test?

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Consider the regression equation: Y = 98.3 +.35X1 + 22.3X2, the predicted value for Y when X1 = 3 and X2 = 5 is ____.

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The statistical test used to determine whether there is more variability in the scores of one sample than in the scores of another sample is the ____________________.

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A Z-test for differences of proportions requires a sample size greater than 100.

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A researcher hypothesizes that males and females differ with respect to attitude toward sports sponsorships.To investigate this hypothesis that these two groups' attitudes differ, the researcher will use a ____.

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Statistical methods that permit the study of three or more variables at the same time are called ____________________ statistical analysis.

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When students tardiness is used to predict the test performance of students in a reqression equation, student tardiness is the ____ variable and test performance is the ____ variable.

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The chi-square test involves comparison of the observed frequencies of the groups with the expected frequencies of the groups.

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