©Themoon EXAM SOLUTIONS
06/11/2024 14:52PM
Statistics Exam Questions and Answers
Positive correlation - answers✓✓As one variable increases, the other variable increases
Negative correlation - answers✓✓As one variable increases, the other decreases
A point on the scatter plot represents how many values? - answers✓✓2 (X and Y)
Relationship between linear and scatter plot diagrams? - answers✓✓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? - answers✓✓First sum the Xs, then sum
the Ys, then multiply the sums
If you see the notation E XY what should you do? - answers✓✓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... - answers✓✓Changes in
some consistent, predictable manner
What does a correlation coefficient do? - answers✓✓It quantifies the pattern in a relationship
In an experimental design _________, whereas in a correlational design ________. -
answers✓✓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
, ©Themoon EXAM SOLUTIONS
06/11/2024 14:52PM
If we calculate a correlation coefficient and we find that there is a relationship between the two
variables, we... - answers✓✓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... -
answers✓✓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? - answers✓✓Professor Johnston is drawing a causal
conclusion from correlational findings
In a correlational analysis, N stands for the - answers✓✓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 - answers✓✓see the nature of the relationship between the two variables
when plotting correlational data, the appropriate graph to use is the - answers✓✓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 - answers✓✓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 - answers✓✓regression line
what type of relationship does a horizontal line parallel to the X axis represent? - answers✓✓No
relationship
, ©Themoon EXAM SOLUTIONS
06/11/2024 14:52PM
What kind of relationship is represented by a line slanting downward from left to right? -
answers✓✓A negative relationship
"the self-confidence of a group of students is positively correlated with their chances of getting
through the course"- what does this statement mean? - answers✓✓The chances of passing the
course tend to increase as the self-confidence scores of the students increase
In general, a positive correlation means that as the values of one variable ______, there is a
tendency for the values of the other variable to _______. - answers✓✓Increase; increase
In a linear relationship, as the X scores increase, the Y scores change... - answers✓✓in only one
direction
"the bigger they are, the harder they fall" describes... - answers✓✓A positive linear correlation
"The more you save, the less you spend" describes... - answers✓✓a negative linear correlation
Prof. Miller found correlation btwn a "need for affiliation" and # of hours spent watching
television is -.69; he should conclude... - answers✓✓As we observe people with higher and
higher need for affiliation, we see a tendency for those people to spend less and less time
watching television
In a non-linear or curvilinear relationship, as the X scores change, the Y scores... -
answers✓✓Change consistently, but in more than one direction
A nonlinear correlation looks like what? - answers✓✓Low to high and back to low, like a
rainbow!
The strength of a relationship is indicated by the extent to which ________ paired with each
individual value of the _________ variable. - answers✓✓One value of the Y variable is;
X
06/11/2024 14:52PM
Statistics Exam Questions and Answers
Positive correlation - answers✓✓As one variable increases, the other variable increases
Negative correlation - answers✓✓As one variable increases, the other decreases
A point on the scatter plot represents how many values? - answers✓✓2 (X and Y)
Relationship between linear and scatter plot diagrams? - answers✓✓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? - answers✓✓First sum the Xs, then sum
the Ys, then multiply the sums
If you see the notation E XY what should you do? - answers✓✓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... - answers✓✓Changes in
some consistent, predictable manner
What does a correlation coefficient do? - answers✓✓It quantifies the pattern in a relationship
In an experimental design _________, whereas in a correlational design ________. -
answers✓✓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
, ©Themoon EXAM SOLUTIONS
06/11/2024 14:52PM
If we calculate a correlation coefficient and we find that there is a relationship between the two
variables, we... - answers✓✓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... -
answers✓✓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? - answers✓✓Professor Johnston is drawing a causal
conclusion from correlational findings
In a correlational analysis, N stands for the - answers✓✓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 - answers✓✓see the nature of the relationship between the two variables
when plotting correlational data, the appropriate graph to use is the - answers✓✓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 - answers✓✓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 - answers✓✓regression line
what type of relationship does a horizontal line parallel to the X axis represent? - answers✓✓No
relationship
, ©Themoon EXAM SOLUTIONS
06/11/2024 14:52PM
What kind of relationship is represented by a line slanting downward from left to right? -
answers✓✓A negative relationship
"the self-confidence of a group of students is positively correlated with their chances of getting
through the course"- what does this statement mean? - answers✓✓The chances of passing the
course tend to increase as the self-confidence scores of the students increase
In general, a positive correlation means that as the values of one variable ______, there is a
tendency for the values of the other variable to _______. - answers✓✓Increase; increase
In a linear relationship, as the X scores increase, the Y scores change... - answers✓✓in only one
direction
"the bigger they are, the harder they fall" describes... - answers✓✓A positive linear correlation
"The more you save, the less you spend" describes... - answers✓✓a negative linear correlation
Prof. Miller found correlation btwn a "need for affiliation" and # of hours spent watching
television is -.69; he should conclude... - answers✓✓As we observe people with higher and
higher need for affiliation, we see a tendency for those people to spend less and less time
watching television
In a non-linear or curvilinear relationship, as the X scores change, the Y scores... -
answers✓✓Change consistently, but in more than one direction
A nonlinear correlation looks like what? - answers✓✓Low to high and back to low, like a
rainbow!
The strength of a relationship is indicated by the extent to which ________ paired with each
individual value of the _________ variable. - answers✓✓One value of the Y variable is;
X
