WGU C955 - Module 6 Test Questions With Verified Answers

regression equation - Answer An equation used to model the relationship between the response and explanatory variables in a regression. extrapolate - Answer Using information from a data set to make predictions about data outside of the original set. significant difference - Answer A measurable difference between two groups or samples that reflects a real difference, rather than the difference being by chance. sampling frame - Answer The list of all people or things that may be included in the statistical study. degree - Answer The largest exponent in a mathematical expression or equation. positive correlation - Answer A linear relationship between two quantitative variables in which the dependent variable increases as the independent variable increases. population - Answer All subjects in the study which have the characteristics being evaluated. scatterplot - Answer A graph that uses dots on a coordinate plane to show the relationship between variables. least squares - Answer A technique for finding the regression line. regression analysis - Answer A statistical analysis tool that quantifies the relationship between a response variable and one or more explanatory variables. voluntary sample - Answer Researchers invite everyone in the sampling frame to participate. Individuals who voluntarily respond comprise the study sample. significance level - Answer The p-value cutoff for statistical significance. Any p-value below the set significance level is considered statistically significant. experimental study - Answer The researcher applies a treatment to one group and no treatment (or placebo) to a control group, to determine if there is causation between variables. Simpson's Paradox - Answer A counterintuitive situation in which a trend in different groups of data disappears or reverses when the groups are combined. slope-intercept form - Answer A common format for the equation of a line: y = mx + b, where m is the slope and b is the y-intercept. association - Answer A pattern or relationship between two variables. observational study - Answer The researcher observes if there is an association between variables. There is no treatment or control group. linear interpolation - Answer Estimation using the linear regression equation in between known data points.