STATISTIC SOPHIA 4 EXAM 100% LATEST CORRECT QUESTIONS AND VERIFIED ANSWERS GRADED A+

STATISTIC SOPHIA 4 EXAM 100% LATEST CORRECT QUESTIONS AND VERIFIED ANSWERS GRADED A+ scatterplot - ANS-A graphical display that allows us to see the relationship between two quantitative variables. Coefficient of Determination (r^2) - ANS-A value that explains the percent of variation in the response variable that can be explained by a linear association with the explanatory variable. It is the square of the correlation coefficient. finding r from r squared - ANS-Step 1: Take the square root of r2. If only r-squared is given, what you have to do is take the square root to obtain the correlation coefficient, r. Step 2: Look at the graph to determine sign. You also have to look at the graph to find the association-- either positive or negative--to determine the sign of the correlation coefficient. outlier - ANS-Points that deviate substantially from the overall form of the remainder of the data points. influential points - ANS-An observation that, if removed, significantly changes a statistical measure inappropriate grouping - ANS-Combining together subgroups that should not be combined, resulting in a weakened, or even reversed, association. correlation - ANS-A statistic which measures the strength and direction of the linear association between two quantitative variables. multiple data sets - ANS-Plotting more than one data set on a scatterplot requires that we use different colors or symbols for the different data sets so we can see the relationships separately. form - ANS-The overall shape of the data points. The form may be linear or nonlinear, or there may not be any form at all to the points if they form a "cloud." direction - ANS-The way one variable responds to an increase in the other. With a negative association, an increase in one variable is associated with a decrease in the other, whereas with a positive association, an increase in one variable is associated with an increase in the other. strength - ANS-The closeness of the points to the indicated form. Points that are strongly linear will all fall on or near a straight line. explanatory variable - ANS-The variable whose increase or decrease we believe helps explain a tendency to increase or decrease in some other variable. response variable - ANS-The variable that tends to increase or decrease due to an increase or decrease in the explanatory variable. correlation - ANS-The strength and direction of a linear association between two quantitative variables. correlation coefficient - ANS-The numerical value between -1 and +1 that measures the correlation between two quantitative variables. positive correlation - ANS-The type of correlation present when two variables have a correlation coefficient generally greater than or equal to 0.5. negative correlation - ANS-The type of correlation present when two variables have a correlation coefficient generally less than or equal to -0.5.