CNSL 503: A GUIDE TO A+. QUESTIONS AND ANSWERS
FORMAT.LATEST UPDATE
The response variable in a study in which college students drank different amounts of beer, was their
blood alcohol content (BAC). BAC for the same amount of beer might depend on other facts about the
students.
Select two other variables that would most likely influence BAC.
Time spent consuming the beer.
Student height.
Student weight.
Student age.
1,3
Coffee is a leading export from several developing countries. When coffee prices are high, farmers
often clear forest to plant more coffee trees. Here are five years' data on prices paid to coffee growers
in Indonesia
Price ($US per pound) 0.34 0.44 0.62 0.47 0.62
Forest lost (percent) 0.77 1.88 1.47 1.53 3.04
What is the correlation (± 0.01) between the price of coffee and the forest loss
in US dollars?
What is the correlation (± 0.01) between the price of coffee and the forest loss in Russian rubles, if the
exchange rate is 26 Russian rubles per US dollar ?
1. 0.69 2. 0.69
For a biology project, you measure the weight in grams and the tail length in millimeters of a group of
mice. The correlation is r = 0.76.
If you had measured tail length in centimeters instead of millimeters, what would be the correlation?
0.76
The Sanchez household is about to install solar panels to reduce the cost of heating their house. In
order to know how much the solar panels help, they record their consumption of natural gas before
the panels are installed. Gas consumption is higher in cold weather, so the relationship between
outside temperature and gas consumption is important. Here are data for 12 consecutive months:
Degree days 19 3 3 0 0 0 8 11 27 46 38 34
Gas used 32 2 1.6 1 0.7 0.7 1.6 3.1 5.1 7.7 7 6.1
Use your calculator or software: the correlation between degree days and overall gas used is about?
, 0.35
When ordering vinyl replacement windows, the following variables are specified for each window.
Which of these variables is quantitative?
A.area of the window opening in square inches
B.window style — double-hung, casement, or awning
C.window style — single pane or double-hung
A. Area of the window opening in square inches
A survey of college students collected information on several variables: Distance from Home, Age,
Major, Gender, and Class. The variable Class is
A. quantitative.
B. categorical.
C. neither categorical nor numeric.
B. Categorical
The bars on a histogram
A.sometimes touch one another.
B.never touch one another.
C.always touch one another.
C. Always touch one another
A high level of glucose in the blood is an indication of diabetes, which is becoming more prevalent in
the United States. Diabetes can lead to many complications, such as blindness and heart disease. A
random sample of 180 individuals had their blood sugar level measured. The results are displayed in
the graph.
A. skewed to the left.
B. symmetric.
C. skewed to the right.
C. Skewed to the right
A high level of glucose in the blood is an indication of diabetes, which is becoming more prevalent in
the United States. Diabetes can lead to many complications, such as blindness and heart disease. A
random sample of 180 individuals had their blood sugar level measured. The results are displayed in
the graph.
Which value might be considered an outlier in the distribution of blood glucose?
A. 39
B. 145
FORMAT.LATEST UPDATE
The response variable in a study in which college students drank different amounts of beer, was their
blood alcohol content (BAC). BAC for the same amount of beer might depend on other facts about the
students.
Select two other variables that would most likely influence BAC.
Time spent consuming the beer.
Student height.
Student weight.
Student age.
1,3
Coffee is a leading export from several developing countries. When coffee prices are high, farmers
often clear forest to plant more coffee trees. Here are five years' data on prices paid to coffee growers
in Indonesia
Price ($US per pound) 0.34 0.44 0.62 0.47 0.62
Forest lost (percent) 0.77 1.88 1.47 1.53 3.04
What is the correlation (± 0.01) between the price of coffee and the forest loss
in US dollars?
What is the correlation (± 0.01) between the price of coffee and the forest loss in Russian rubles, if the
exchange rate is 26 Russian rubles per US dollar ?
1. 0.69 2. 0.69
For a biology project, you measure the weight in grams and the tail length in millimeters of a group of
mice. The correlation is r = 0.76.
If you had measured tail length in centimeters instead of millimeters, what would be the correlation?
0.76
The Sanchez household is about to install solar panels to reduce the cost of heating their house. In
order to know how much the solar panels help, they record their consumption of natural gas before
the panels are installed. Gas consumption is higher in cold weather, so the relationship between
outside temperature and gas consumption is important. Here are data for 12 consecutive months:
Degree days 19 3 3 0 0 0 8 11 27 46 38 34
Gas used 32 2 1.6 1 0.7 0.7 1.6 3.1 5.1 7.7 7 6.1
Use your calculator or software: the correlation between degree days and overall gas used is about?
, 0.35
When ordering vinyl replacement windows, the following variables are specified for each window.
Which of these variables is quantitative?
A.area of the window opening in square inches
B.window style — double-hung, casement, or awning
C.window style — single pane or double-hung
A. Area of the window opening in square inches
A survey of college students collected information on several variables: Distance from Home, Age,
Major, Gender, and Class. The variable Class is
A. quantitative.
B. categorical.
C. neither categorical nor numeric.
B. Categorical
The bars on a histogram
A.sometimes touch one another.
B.never touch one another.
C.always touch one another.
C. Always touch one another
A high level of glucose in the blood is an indication of diabetes, which is becoming more prevalent in
the United States. Diabetes can lead to many complications, such as blindness and heart disease. A
random sample of 180 individuals had their blood sugar level measured. The results are displayed in
the graph.
A. skewed to the left.
B. symmetric.
C. skewed to the right.
C. Skewed to the right
A high level of glucose in the blood is an indication of diabetes, which is becoming more prevalent in
the United States. Diabetes can lead to many complications, such as blindness and heart disease. A
random sample of 180 individuals had their blood sugar level measured. The results are displayed in
the graph.
Which value might be considered an outlier in the distribution of blood glucose?
A. 39
B. 145
