STATISTICS COMPREHENSIVE EXAM PAPER
TEST BANK FULL SOLUTION UPDATED 2026
WITH 100% CORRECT ANSWERS
◉Negative correlation . Answer: As one variable increases, the other
decreases
◉A point on the scatter plot represents how many values? . Answer: 2
(X and Y)
◉Relationship between linear and scatter plot diagrams? . Answer: The
regression line is the best-fitting line through a scatter plot
◉If you see the notation (E X)(E Y) what should you do? . Answer: First
sum the Xs, then sum the Ys, then multiply the sums
◉If you see the notation E XY what should you do? . Answer: First
multiply each X by its partner Y, then sum the results
◉If there is a relationship between "amount of coffee consumed" and
"nervousness", then as the amount of coffee consumed increases, the
,amount of nervousness... . Answer: Changes in some consistent,
predictable manner
◉What does a correlation coefficient do? . Answer: It quantifies the
pattern in a relationship
◉In an experimental design _________, whereas in a correlational
design ________. . Answer: researchers assign each person an X score
and then measure the score on the Y variable;
researchers measure scores on variables that a participant has already
experienced
◉If we calculate a correlation coefficient and we find that there is a
relationship between the two variables, we... . Answer: cannot conclude
that changes in one variable cause changes in the other variable
◉Using correlation design, a researcher found a relationship between
the healthiness of one's heart and the amount of fish oil in one's diet. The
researcher should conclude that... . Answer: although a relationship
exists, one cannot infer that changes in one variable are causing changes
in another variable
◉Professor Johnston and strong correlation between neckties and
strokes; claims wearing neckties causes strokes. What error has he
made? . Answer: Professor Johnston is drawing a causal conclusion from
correlational findings
, ◉In a correlational analysis, N stands for the . Answer: total number of
pairs of scores
◉We should do a scatterplot of the data when we compute a correlation
because the scatterplot allows us to . Answer: see the nature of the
relationship between the two variables
◉when plotting correlational data, the appropriate graph to use is the .
Answer: scatterplot!
◉To know whether theres a relationship btwn two variables, you draw a
line around the outer edges of a scatterplot. You can tell there is no
relationship when . Answer: the scatterplot is either circular or elliptical,
with the ellipse being parallel to the X axis
◉The best-fitting line through a scatterplot is known as the . Answer:
regression line
◉what type of relationship does a horizontal line parallel to the X axis
represent? . Answer: No relationship
◉What kind of relationship is represented by a line slanting downward
from left to right? . Answer: A negative relationship
TEST BANK FULL SOLUTION UPDATED 2026
WITH 100% CORRECT ANSWERS
◉Negative correlation . Answer: As one variable increases, the other
decreases
◉A point on the scatter plot represents how many values? . Answer: 2
(X and Y)
◉Relationship between linear and scatter plot diagrams? . Answer: The
regression line is the best-fitting line through a scatter plot
◉If you see the notation (E X)(E Y) what should you do? . Answer: First
sum the Xs, then sum the Ys, then multiply the sums
◉If you see the notation E XY what should you do? . Answer: First
multiply each X by its partner Y, then sum the results
◉If there is a relationship between "amount of coffee consumed" and
"nervousness", then as the amount of coffee consumed increases, the
,amount of nervousness... . Answer: Changes in some consistent,
predictable manner
◉What does a correlation coefficient do? . Answer: It quantifies the
pattern in a relationship
◉In an experimental design _________, whereas in a correlational
design ________. . Answer: researchers assign each person an X score
and then measure the score on the Y variable;
researchers measure scores on variables that a participant has already
experienced
◉If we calculate a correlation coefficient and we find that there is a
relationship between the two variables, we... . Answer: cannot conclude
that changes in one variable cause changes in the other variable
◉Using correlation design, a researcher found a relationship between
the healthiness of one's heart and the amount of fish oil in one's diet. The
researcher should conclude that... . Answer: although a relationship
exists, one cannot infer that changes in one variable are causing changes
in another variable
◉Professor Johnston and strong correlation between neckties and
strokes; claims wearing neckties causes strokes. What error has he
made? . Answer: Professor Johnston is drawing a causal conclusion from
correlational findings
, ◉In a correlational analysis, N stands for the . Answer: total number of
pairs of scores
◉We should do a scatterplot of the data when we compute a correlation
because the scatterplot allows us to . Answer: see the nature of the
relationship between the two variables
◉when plotting correlational data, the appropriate graph to use is the .
Answer: scatterplot!
◉To know whether theres a relationship btwn two variables, you draw a
line around the outer edges of a scatterplot. You can tell there is no
relationship when . Answer: the scatterplot is either circular or elliptical,
with the ellipse being parallel to the X axis
◉The best-fitting line through a scatterplot is known as the . Answer:
regression line
◉what type of relationship does a horizontal line parallel to the X axis
represent? . Answer: No relationship
◉What kind of relationship is represented by a line slanting downward
from left to right? . Answer: A negative relationship
