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Study Resources (Statistics)

1. Gallup tracks daily the percentage of Americans who approve or disapprove of the job Barack Obama is doing as president. Daily results are based on telephone interviews with approximately 1,500 national adults; Margin of error is ±3 percentage points. What is the confidence level used in Gallup’s polls?.
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1. For each part below, CIRCLE the ONE BEST answer. (a) A scale-location plot is intended to diagnose curvature in the mean heteroscedasticity both neither (b) Variance inflation factors are computed from the dependent variable the independent variables both neither (c) Generalized least squares is a special case of measurement.
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1. Formulating null and alternative hypotheses and identifying Type I and II errors Aa Aa EL A finance professor conducts a statistical study to test his hunch that the mean return on common-stock portfolios is lower with an active trading strategy than with a more passive hold strategy Formulate the.
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1. Identify the following as paired samples or independent samples. In each case, give the appropriate df. a. Thirteen volunteers weighed themselves before and after a two-day fast. b. The attitudes toward plagiarism of 21 famous psychologists were compared to those of each one's designated "best student." c. Eight volunteers.
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1.) Hypothesis testing and specifically hypothesis testing for the difference in two means can be useful when investigating whether two populations are being treated equally or performing equally and such questions do arise in business (comparing two production processes), public policy (comparing outcomes of social programs) and legal settings (such.
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