Applied Probability and Statistics - C955 - Module 6:
Correlation & Regression. Comprehensive revision
questions with precise answers. Success champs!!
lurking variable - Correct Answers-A variable that is not included in an analysis but that is
related to two (or more) other associated variables which were analyzed.
observational study - Correct Answers-The researcher observes if there is an association
between variables. There is no treatment or control group.
sampling method - Correct Answers-The technique used to select people within the sampling
frame.
correlation - Correct Answers-An observed relationship between two quantitative variables.
While this is most commonly a linear relationship, it does not need to be. Note that observing a
relationship does NOT imply that there is a meaningful causal link between the variables.
coordinate plane - Correct Answers-A tool for graphing consisting of a horizontal x-axis and a
vertical y-axis.
correlation coefficient - Correct Answers-A measure of the linear relationship between two
attributes. The numerical value demonstrates how closely the attributes vary together.
Correlation coefficients near -1 and +1 have strong linear correlation, while a correlation
coefficient near 0 has weak (or no) linear correlation.
linear interpolation - Correct Answers-Estimation using the linear regression equation in
between known data points.
least squares - Correct Answers-A technique for finding the regression line.
voluntary sample - Correct Answers-Researchers invite everyone in the sampling frame to
participate. Individuals who voluntarily respond comprise the study sample.
scatterplot - Correct Answers-A graph that uses dots on a coordinate plane to show the
relationship between variables.
representative sample - Correct Answers-A subset of the population with similar characteristics
Correlation & Regression. Comprehensive revision
questions with precise answers. Success champs!!
lurking variable - Correct Answers-A variable that is not included in an analysis but that is
related to two (or more) other associated variables which were analyzed.
observational study - Correct Answers-The researcher observes if there is an association
between variables. There is no treatment or control group.
sampling method - Correct Answers-The technique used to select people within the sampling
frame.
correlation - Correct Answers-An observed relationship between two quantitative variables.
While this is most commonly a linear relationship, it does not need to be. Note that observing a
relationship does NOT imply that there is a meaningful causal link between the variables.
coordinate plane - Correct Answers-A tool for graphing consisting of a horizontal x-axis and a
vertical y-axis.
correlation coefficient - Correct Answers-A measure of the linear relationship between two
attributes. The numerical value demonstrates how closely the attributes vary together.
Correlation coefficients near -1 and +1 have strong linear correlation, while a correlation
coefficient near 0 has weak (or no) linear correlation.
linear interpolation - Correct Answers-Estimation using the linear regression equation in
between known data points.
least squares - Correct Answers-A technique for finding the regression line.
voluntary sample - Correct Answers-Researchers invite everyone in the sampling frame to
participate. Individuals who voluntarily respond comprise the study sample.
scatterplot - Correct Answers-A graph that uses dots on a coordinate plane to show the
relationship between variables.
representative sample - Correct Answers-A subset of the population with similar characteristics
