Two-way Tables
BPS chapter 6
© 2006 W.H. Freeman and Company
Summarizing data
To summarize data on the closing stock prices of AT&T and Sprint for
90 days, you should use
a)
b)
c)
a scatterplot.
a two-way table.
none of the above.
Summarizing data (answer)
To summarize data on the closing stock prices of AT&T and Sprint for
90 days, you should use
a)
b)
c)
a scatterplot.
a two-way table.
none of the above.
Summarizing data
To summarize data on whether subjects received a flu vaccine and
whether they developed the flu during one winter season, you
should use
a)
b)
c)
a scatterplot.
a two-way table.
none of the above.
Summarizing data (answer)
To summarize data on whether subjects received a flu vaccine and
whether they developed the flu during one winter season, you
should use
a)
b)
c)
a scatterplot.
a two-way table.
none of the above.
Summarizing data
To summarize data on gender and heart rates (number of beats per
minute), you should use
a)
b)
c)
a scatterplot.
a two-way table.
none of the above.
Summarizing data (answer)
To summarize data on gender and heart rates (number of beats per
minute), you should use
a)
b)
c)
a scatterplot.
a two-way table.
none of the above.
Two-way tables
The following two-way table summarizes the number of cancer patients
treated at two cancer clinics who died or survived. What
percentage of the cancer patients survived?
a)
b)
c)
d)
390 / 1000 = 39%
320 / 1000 = 32%
710 / 1000 = 71%
290 / 1000 = 29%
Two-way tables (answer)
The following two-way table summarizes the number of cancer patients
treated at two cancer clinics who died or survived. What
percentage of the cancer patients survived?
a)
b)
c)
d)
390 / 1000 = 39%
320 / 1000 = 32%
710 / 1000 = 71%
290 / 1000 = 29%
Two-way tables
The following two-way table summarizes the number of cancer patients
treated at two cancer clinics who died or survived. What
percentage of the cancer patients at Clinic A survived?
a)
b)
c)
d)
390 / 1000 = 39%
390 / 710 = 55%
710 / 1000 = 71%
390 / 600 = 65%
Two-way tables (answer)
The following two-way table summarizes the number of cancer patients
treated at two cancer clinics who died or survived. What
percentage of the cancer patients at Clinic A survived?
a)
b)
c)
d)
390 / 1000 = 39%
390 / 710 = 55%
710 / 1000 = 71%
390 / 600 = 65%
Two-way tables
The following two-way table summarizes the number of cancer patients
treated at two cancer clinics who died or survived. What
percentage of the cancer patients who survived were treated at
Clinic B?
a)
b)
c)
d)
320 / 1000 = 32%
320 / 400 = 80%
320 / 710 = 45%
710 / 1000 = 71%
Two-way tables (answer)
The following two-way table summarizes the number of cancer patients
treated at two cancer clinics who died or survived. What
percentage of the cancer patients who survived were treated at
Clinic B?
a)
b)
c)
d)
320 / 1000 = 32%
320 / 400 = 80%
320 / 710 = 45%
710 / 1000 = 71%
Two-way tables
The following two-way table summarizes the number of single and
married students in a basic statistics course who like watching
professional football. The percentage of students in this class who
are married is considered
a)
b)
c)
A marginal percentage
A conditional percentage
Something else
Two-way tables (answer)
The following two-way table summarizes the number of single and
married students in a basic statistics course who like watching
professional football. The percentage of students in this class who
are married is considered
a)
b)
c)
A marginal percentage
A conditional percentage
Something else
Two-way tables
The following two-way table summarizes the number of single and
married students in a basic statistics course who like watching
professional football. The percentage of married students in this
class who like football is considered
a)
b)
c)
A marginal percentage
A conditional percentage
Something else
Two-way tables (answer)
The following two-way table summarizes the number of single and
married students in a basic statistics course who like watching
professional football. The percentage of married students in this
class who like football is considered
a)
b)
c)
A marginal percentage
A conditional percentage
Something else
Two-way tables
The following two-way table summarizes the number of single and
married students in a basic statistics course who like watching
professional football. The percentage students who are married
and do not like football is considered
a)
b)
c)
A marginal percentage
A conditional percentage
Something else
Two-way tables (answer)
The following two-way table summarizes the number of single and
married students in a basic statistics course who like watching
professional football. The percentage students who are married
and do not like football is considered
a)
b)
c)
A marginal percentage
A conditional percentage
Something else
Association
A study was conducted to determine whether the amount of time
students spend practicing concepts on the computer is associated
with their math score on the Iowa Test of Basic Skills (ITBS).
Computer time and ITBS math score was recorded on students at
three schools.
Results
•
Overall, the association between computer time and math score
was negative.
•
Within each school, the association between computer time and
math score was positive.
Given the results of this study, what can you conclude?
a)
b)
c)
The association between computer time and math score is the
result of a cause and effect relationship.
Variables with a strong curved relationship can have a correlation of
zero.
Simpson’s paradox is present.
Association (answer)
A study was conducted to determine whether the amount of time
students spend practicing concepts on the computer is associated
with their math score on the Iowa Test of Basic Skills (ITBS).
Computer time and ITBS math score was recorded on students at
three schools.
Results
•
Overall, the association between computer time and math score
was negative.
•
Within each school, the association between computer time and
math score was positive.
Given the results of this study, what can you conclude?
a)
b)
c)
The association between computer time and math score is the
result of a cause and effect relationship.
Variables with a strong curved relationship can have a correlation of
zero.
Simpson’s paradox is present.
Simpson’s paradox
Do the following show Simpson’s paradox?
a)
b)
Yes.
No.
Simpson’s paradox (answer)
Do the following show Simpson’s paradox?
a)
b)
Yes.
No.