Ch 3 Ivy Software Business & Math Stats
UPDATED ACTUAL Questions and
CORRECT Answers
regression analysis - CORRECT ANSWER - method of forecasting, not limited to
predicting unknown variable solely from historical levels of that same variable but is able to
predict based on
y=what forecaster wishes to predict, dependent variable
x=which forecast depends, independent variable
coefficient of determination - CORRECT ANSWER - how much variation about mean
line
variable you are trying to predict with regression analysis is referred to as the independent
variable. true or false - CORRECT ANSWER - false-dependent variable
regression analysis attempts to find the line through a scatter of data points which decreases the
sum of the squared deviations of the points from the line. true or false - CORRECT
ANSWER - true
the coefficient of determination is the unexplained variation divided by total variation. true or
false - CORRECT ANSWER - false explained/total
suppose 2 judges each score 5 divers using scale 1-12. correlation coefficient between judges is
1, mean judges gave divers is the same score. true or false - CORRECT ANSWER - false,
correlation coefficient measures strength not whether scores are lower, higher or the same. A
correlation coefficient could be obtained by giving different scores to divers
an r^2 of .5 that has x goes up, y goes down and vice versa. true or false - CORRECT
ANSWER - false, r tells us which way y would change as x changes
UPDATED ACTUAL Questions and
CORRECT Answers
regression analysis - CORRECT ANSWER - method of forecasting, not limited to
predicting unknown variable solely from historical levels of that same variable but is able to
predict based on
y=what forecaster wishes to predict, dependent variable
x=which forecast depends, independent variable
coefficient of determination - CORRECT ANSWER - how much variation about mean
line
variable you are trying to predict with regression analysis is referred to as the independent
variable. true or false - CORRECT ANSWER - false-dependent variable
regression analysis attempts to find the line through a scatter of data points which decreases the
sum of the squared deviations of the points from the line. true or false - CORRECT
ANSWER - true
the coefficient of determination is the unexplained variation divided by total variation. true or
false - CORRECT ANSWER - false explained/total
suppose 2 judges each score 5 divers using scale 1-12. correlation coefficient between judges is
1, mean judges gave divers is the same score. true or false - CORRECT ANSWER - false,
correlation coefficient measures strength not whether scores are lower, higher or the same. A
correlation coefficient could be obtained by giving different scores to divers
an r^2 of .5 that has x goes up, y goes down and vice versa. true or false - CORRECT
ANSWER - false, r tells us which way y would change as x changes
