Module 7 Correlational Analysis and Linear Regression exam with correct answers

Module 7 Correlational Analysis and |||\\\ |||\\\ |||\\\ |||\\\ |||\\\




Linear Regression exam with correct |||\\\ |||\\\ |||\\\ |||\\\ |||\\\




answes

___ is performed to measure and describe how two quantitative variables are related - correct
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\




answersCorrelational analysis
|||\\\ |||\\\




Correlational analysis is performed when variables are observed in their ___ rather than being |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\




manipulated in a study - correct answersobserved in their natural state |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\




___ describes the direction of a relationship, form of a relationship (linear, curvilinear,
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\




quadratic, or cubic), and the degree of a relationship. - correct answersCorrelation |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\




___ describes the direction of the linear relationship between two variables - correct
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\




answersCovariance



If two variables covary, one of two directions exist in the plot of variables:
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\




1. |||\\\




2. - correct answers1. Both variables increase or decrease together.
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\




OR

2. As one variable increases the other decreases
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\




Covariance does not imply __ - correct answersCovariance does not imply causation |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\




___ is a limitation of correlational studies, however, correlation being established is the first
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\




step in determining ___ - correct answersCausation, causality
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\

, The most common ways correlations are represented graphically are with ___, a graph in which
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\




two measurements are obtained from each individual in the study and paired variable scores
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\




are plotted as coordinate pairs. - correct answersscatterplots
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\




In scatterplots, the independent variable is on the ___ and the dependent variable is on the __
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\




- correct answersIn scatterplots, the independent variable is on the x-axis and the dependent
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\




variable is on the y-axis. |||\\\ |||\\\ |||\\\ |||\\\




In scatterplots, the independent variable is called the ___ and the dependent variable is called
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\




the __ - correct answersexplanatory, response
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\




A linear relationship describes when plotted pairs ___ - correct answersapproximate a straight
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\




line



A positive correlation indicates - correct answersthat both variables are increasing together
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\




A negative correlation indicates - correct answersthat an increase in the explanatory variable
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\




results in a decrease in response variables |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\




No correlation indicates - correct answersThere is no relationship between two variables, on a
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\




scatterplot points are spread out and do not resemble a straight line. |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\




When values of two variables appear to be related, but the relationship does not follow a
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\




linear pattern, this is called a ___ relationship - correct answersnonlinear or curvilinear
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\




relationship (for example exponential relationship) |||\\\ |||\\\ |||\\\ |||\\\




The ___, Pearson's r, measures the degree of linear relationship or consistency of the
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\




relationship - correct answerscorrelation coefficient |||\\\ |||\\\ |||\\\ |||\\\ |||\\\