STT 200 TEST 2 – QUESTIONS AND ANSWERS (Rated
A+)
Which one of the following is not appropriate for studying the relationship
between two quantitative variables? Right Ans - Bar chart
Which one of the following is a variable that we usually put on the horizontal
axis of a scatterplot? Right Ans - explanatory variable
Which one of the following cannot be determined from a scatterplot? Right
Ans - a cause and effect relationship
A scatter plot is a Right Ans - 2-dimensional graph of data values
Two variables have a positive association when Right Ans - the values of
one variable tend to increase as the values of the other variable increase
Describe the type of association shown in the scatter plot
-gradually goes up to right Right Ans - positive curvilinear association
Describe the type of association shown in the scatter plot
-gradually goes down to the right Right Ans - negative curvilinear
association
Describe the type of association shown in the scatter plot
-straight line to the right going up Right Ans - positive linear association
Describe the type of association shown in the scatter plot
-straight line going down to the right Right Ans - negative linear
association
Which of the following sets of variables is most likely to have a negative
association? Right Ans - the age of the mother and the ability to have
children
Which of the following sets of variables is most likely to have a negative
association? Right Ans - the age of the house and the cleanliness of the
carpets inside
, A scatterplot of geographic latitude and average January temperature for 20
cities in the United States is given below. Is there a positive association or a
negative association?
-goes down the right Right Ans - there is a negative association
Scatter plot of y=height and x=left forearm length for 55 college students is
given below. Is there a positive or a negative association?
-goes up to the right Right Ans - there is a positive association
Scatterplot shows the association between weight and age for 19 female
bears. Is it positive or negative?
-gradually to the right Right Ans - positive association
Which graph shows a pattern that would be appropriately described by the
equation y=b0 + b1x Right Ans - straight line going up to the right
In the simple linear regression equation, the symbol y represents the Right
Ans - average or predicted response
the term b0 represents the Right Ans - estimated intercept
the term b1 represents the Right Ans - estimated slope
the symbol x represents Right Ans - explanatory variable
A group of adults aged 20 to 80 were tested to see how far away they could
first hear an ambulance coming towards them. An equation describing the
relationship between the distance and age was found to be
Distance= 600 - 3 x age
Estimate the distance for an individual who is 20 years old Right Ans - 540
feet
How much does the estimated distance change when age is increased by 1?
Right Ans - It goes down by 3 feet
A+)
Which one of the following is not appropriate for studying the relationship
between two quantitative variables? Right Ans - Bar chart
Which one of the following is a variable that we usually put on the horizontal
axis of a scatterplot? Right Ans - explanatory variable
Which one of the following cannot be determined from a scatterplot? Right
Ans - a cause and effect relationship
A scatter plot is a Right Ans - 2-dimensional graph of data values
Two variables have a positive association when Right Ans - the values of
one variable tend to increase as the values of the other variable increase
Describe the type of association shown in the scatter plot
-gradually goes up to right Right Ans - positive curvilinear association
Describe the type of association shown in the scatter plot
-gradually goes down to the right Right Ans - negative curvilinear
association
Describe the type of association shown in the scatter plot
-straight line to the right going up Right Ans - positive linear association
Describe the type of association shown in the scatter plot
-straight line going down to the right Right Ans - negative linear
association
Which of the following sets of variables is most likely to have a negative
association? Right Ans - the age of the mother and the ability to have
children
Which of the following sets of variables is most likely to have a negative
association? Right Ans - the age of the house and the cleanliness of the
carpets inside
, A scatterplot of geographic latitude and average January temperature for 20
cities in the United States is given below. Is there a positive association or a
negative association?
-goes down the right Right Ans - there is a negative association
Scatter plot of y=height and x=left forearm length for 55 college students is
given below. Is there a positive or a negative association?
-goes up to the right Right Ans - there is a positive association
Scatterplot shows the association between weight and age for 19 female
bears. Is it positive or negative?
-gradually to the right Right Ans - positive association
Which graph shows a pattern that would be appropriately described by the
equation y=b0 + b1x Right Ans - straight line going up to the right
In the simple linear regression equation, the symbol y represents the Right
Ans - average or predicted response
the term b0 represents the Right Ans - estimated intercept
the term b1 represents the Right Ans - estimated slope
the symbol x represents Right Ans - explanatory variable
A group of adults aged 20 to 80 were tested to see how far away they could
first hear an ambulance coming towards them. An equation describing the
relationship between the distance and age was found to be
Distance= 600 - 3 x age
Estimate the distance for an individual who is 20 years old Right Ans - 540
feet
How much does the estimated distance change when age is increased by 1?
Right Ans - It goes down by 3 feet
