Applied Probability and Statistics - C955
- Module 6: Correlation & Regression
Exam 2025 With 100% Correct Answers
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.
- Module 6: Correlation & Regression
Exam 2025 With 100% Correct Answers
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.
