# Shared Flashcard Set

## Details

Statistics
Final Exam Slide Notes Weeks 4 and 5
41
10/24/2011

Term
 8 Steps in Testing RelationshipsStep 1
Definition
 Statement of Null Research Hypothesis
Term
 8 Steps in Testing RelationshipsStep 2
Definition
 Setting Level of Risk or Significance
Term
 8 Steps in Testing RelationshipsSteps 3 and 4
Definition
 Selection of Appropriate Test
Term
 8 Steps in Testing RelationshipsStep 5
Definition
 Determination of Value for Rejection
Term
 8 Steps in Testing RelationshipsStep 6
Definition
 A Comparison of Obtained and Critical Value
Term
 8 Steps in Testing RelationshipsSteps 7 and 8
Definition
 Making a Decision
Term
 True or FalseJUST BECAUSE TWO VARIABLES ARE RELATED TO ONE ANOTHER, THIS HAS NO BEARING ON WHETHER ONE CAUSES THE OTHER.
Definition
 True
Term
 True or False Just because a correlation coeffiecient is significant, it does not mean its meaningful
Definition
 True
Term
 EVEN IF THERE IS A POSITIVE RELATIONSHIP, AND IF THERE IS A RELATIVELY SMALL CORRELATION, THEN
Definition
 THERE IS AN INDICATION THERE ARE LOTS OF OTHER THINGS GOING ON IN THAT RELATIONSHIP THAT MAY BE IMPORTANT AS WELL
Term
 Prediction or Forecast
Definition
 A statement about the way things will happen in the future, often by not always based on experience or knowledge.
Term
 Logic of Prediction
Definition
 Although guaranteed information about the information is in many cases impossible, prediction is necessary to allow plans to be made about possible developments
Term
 True or FalsePrediction is closely related to uncertainty.
Definition
 True
Term
 How do we begin to predict a result with a graph?
Definition
 Create a regression equation, plot a regression line, or best line to fit.
Term
 When using a scatter plot, regression equation, to come up with a best line or fit, it allows us to.
Definition
 Use our best estimate.
Term
 Error in Prediction
Definition
 The distance between each individual data point and the regression line.
Term
 Coefficient of Determination
Definition
 Used in context of statistical models whose main purpose is the prediction of future outcomes on the basis of other related information.
Term
 R Squared
Definition
 The square of the sample of correlation efficient between the outcomes and their predicted values, or in the case of simple linear regression, between the outcomes and the values of the single regressor being used for prediction.
Term
 What range does the coefficient of determination cover?
Definition
 0 to 1
Term
 Determining the score on one variable (criterian or dependent variable).
Definition
 Prediction
Term
 From the value of another score (predictor or independent variable)
Definition
 Prediction
Term
 The higher the magnitude of correlation between the two variables, the _______ the prediction.
Definition
 Better
Term
 This tells us how much imprecision there is in an estimate?
Definition
 Standard error of estimate value.
Term
 The higher the correlation the ________the error.
Definition
 Lower
Term
 If correlation is +1 or -1, the standard error estimate is.
Definition
Term
 If all data points fall on the regression line, than there is ______________ in the error estimate.
Definition
 No error.
Term
 Closer to regression line is better or worse prediction.
Definition
 Better
Term
 Standard error estimate is 0, than prediction is __________.
Definition
 Prefect
Term
 Parametric Statistics
Definition
 A branch of statistics that assumes that data have come from a type of probability distribution and makes inferences about the parameters of the distribution.
Term
 Nonparametric Statistics
Definition
 Distribution-Free statisticsDo not require same assumptions as parametric tests.
Term
 One-Sample Chi-Square
Definition
 Allows you to determine if what you observe in a distribution of frequencies would be what you expect to occur by chance.
Term
 Anova used to ___________.
Definition
 test hypothesis, used when more than two groups are being tested, and these groups are compared on average.
Term
 One way analysis of variance or single factor
Definition
 ANOVA - a technique used to compare means of two of more samples (using F distribution). The can only be used for numerical data.
Term
 Factorial ANOVA (including two way ANOVA)
Definition
 1 continuous dependent variable with normal distribution2 or more categorical independent variables
Term
 Two Factor Anova
Definition
 factorial design where there is more than one treatment factor being explored.
Term
 F Test
Definition
 In one way analysis of variance is used to assess whether the expected values of a quantitative variable within several predefined groups differ from each other.
Term
 An F-test is any statistical test in which the test statistic has an F-distribution under the null hypothesis
Definition
 It is most often used when comparing statistical models that have been fit to a data set, in order to identify the model that best fits the population from which the data were sampled.
Term
 Two factor ANOVA
Definition
 FACTORAL DESIGN WHRE THERE IS MORE THAN ONE TREATMENT FACTOR BEING EXPLORED.
Term
 A one-way ANOVA measures the effect of one independent variable on a dependent variable, WHEREASA two-way ANOVA
Definition
 measures the effect of two independent variables on the dependent variable.
Term
 FACTORIAL ANALYSIS OF VARIANCE
Definition
 Factorial ANOVA measures whether a combination of independent variables predict the value of a dependent variable.
Term
 The goodness of fit of a statistical model describes
Definition
 how well it fits a set of observations. Measures of goodness of fit typically summarize the discrepancy between observed values and the values expected under the model in question.
Term
 Would you pay attention to an r square of .5
Definition
 No
Supporting users have an ad free experience!