MATH 225N STATISTICS FINAL EXAM 2 LATEST
VERSIONS /MATH 225N WEEK 8 FINAL EXAM
QUESTIONS AND DETAILED ANSWERS|ALREADY
GRADED A+(CHAMBERLAINE UNIVERSITY)
A large state university conducted a survey among their students and received 400
responses. The survey asked the students to provide the following information:
*Age
*Year in School (Freshman, Sophomore, Junior, Senior)
*Major
What type of graph would you use to describe the variable Major? - ANSWER: A bar
chart because Major is a categorical variable.
Parking at a university has become a problem. University administrators are
interested in determining the average time it takes a student to find a parking spot.
An administrator inconspicuously followed 180 students and recorded how long it
took each of them to find a parking spot. Which of the following types of graphs
should NOT be used to display information concerning the students parking times? -
ANSWER: pie chart
A large state university conducted a survey among their students and received 300
responses. The survey asked the students to provide the following information:*
Age* Year in School (Freshman, Sophomore, Junior, Senior)* Gender* GPA -
ANSWER: A histogram because Age is a numerical variable.
The two histograms below display the exact same data. How do the plots differ? -
ANSWER: Histogram (i) uses relative frequencies to show the proportion of
observations at a given value. Histogram (ii) uses frequencies to simply count the
number of observations at a given value.
In a survey, high school graduates were asked "Did you play sports in high school?"
The response was electronically recorded as a "1" for yes and a "0" for no. This is an
example of . - ANSWER: coded categorical data
In a survey, married couples were asked, "Do you have children?" The response was
electronically recorded as a "1" for yes and a "0" for no. This is an example of . -
ANSWER: Coded categorical data
In a study of 900 adults, 45 out of the 325 men in the study said that they preferred
to rent a movie on DVD rather than going out to a movie theater.What is the
approximate percentage of men in this study who prefer to rent a movie on DVD? -
ANSWER: 13.8%
,In a study of 1350 elementary school children, 118 out of the 615 girls in the study
said they want to be a teacher when they grow up.What percent of girls want to be a
teacher when they grow up? - ANSWER: 19.2%
The histogram below shows the distribution of pass rates on a swimming test taken
by all children who completed a four week summer swim course at the local YMCA.
What is the typical pass rate for the swim test? - ANSWER: about 75%
Marital status of each member of a randomly selected group of adults is an example
of what type of variable? - ANSWER: categorical variable
The number of parents who attended parent teacher conferences at a local
elementary school is an example of what type of variable? - ANSWER: numerical
variable
A group of 500 patients who suffer from hypothyroidism, a condition in which your
thyroid does not produce enough of certain hormones, were asked to participate in
a study to determine the effectiveness of a new medication. The patients were
randomly divided into two groups, one that was given the actual medication, and
one that received a placebo pill. The results of the study are below.
Was the new medication effective in treating hypothyroidism? - ANSWER: Yes, a
higher percent of patients who took the medication had improved symptoms than
the patients who took the placebo.
Which of the following would likely show a bimodal distribution in a histogram? -
ANSWER: The heights of all students in a high school band.
A doctor is interested in determining whether a certain medication increases the risk
of high blood pressure. He reviews his patients' medical records and finds that a
higher proportion of people who take the medication are suffering from high blood
pressure. - ANSWER: observational study
A group of students is divided into two groups. One group is a given a new chewable
vitamin and the other group is given a placebo. After six months they are asked to fill
out a questionnaire and given a health exam to see whether the new vitamin has
health benefits that are better than a placebo. - ANSWER: controlled experiment
A group of students is divided into two groups. One group listens to classical music
while taking a math test and the other group takes the test in silence. The average
test scores of the two groups are compared to see whether listening to music during
a math test has an effect on scores. - ANSWER: Controlled experiment
A group of cancer patients is divided into two groups. One group is given a new drug
to fight the side effects of chemotherapy and the other group is given a placebo.
After three months they are asked to respond to a questionnaire about the
, frequency and severity of their side effects to see whether the new drug improved
the overall negative side effects of chemotherapy. - ANSWER: Controlled experiment
The table gives the GPA and gender of students in a business class.Is the format of
the data set stacked or unstacked? - ANSWER: stacked
The table gives the GPA of some students in two math classes. One class meets in
the morning and one in the afternoon.
Is the format of the data set stacked or unstacked? - ANSWER: unstacked
A two-way table could be used for which of the following pairs of variables? -
ANSWER: gender and favorite class
A word cloud was created using the first chapter of John Green's The Fault in Our
Stars. (Note that filler words such as "the," "a/an," and "and" were excluded from
the plot.)
What information is NOT explicitly portrayed in the word cloud? - ANSWER: The
number of times each word occurs.
Consider the following statement, "In a nationwide study, children on an all-organic
diet are more alert in school than those not on an all-organic diet." Which of the
following is a plausible confounding variable in this study? - ANSWER: School start
times
The quality of the non-organic diet
Parents' social-economic status
Determine which of the following five variables are numerical and which are
categorical.
age, gender, weight, ethnicity, favorite math class - ANSWER: Age and weight are
numerical variables. Gender, ethnicity, and favorite math class are categorical
variables.
In a sample of 775 senior citizens, approximately 67% said that they had seen a
television commercial for life insurance. About how many senior citizens is this? -
ANSWER: 519
Data was collected on hand grip strength of adults. The histogram below summarizes
the data. Which statement is true about the distribution of the data shown in the
graph? - ANSWER: The graph shows evidence that two different groups may have
been combined into one collection.
A gym is offering a new 6-week diet plan for its members. Members who sign up for
the program are weighed and measured once a week for the duration of the
program. The owners of the gym want to know if the diet plan actually helps people
VERSIONS /MATH 225N WEEK 8 FINAL EXAM
QUESTIONS AND DETAILED ANSWERS|ALREADY
GRADED A+(CHAMBERLAINE UNIVERSITY)
A large state university conducted a survey among their students and received 400
responses. The survey asked the students to provide the following information:
*Age
*Year in School (Freshman, Sophomore, Junior, Senior)
*Major
What type of graph would you use to describe the variable Major? - ANSWER: A bar
chart because Major is a categorical variable.
Parking at a university has become a problem. University administrators are
interested in determining the average time it takes a student to find a parking spot.
An administrator inconspicuously followed 180 students and recorded how long it
took each of them to find a parking spot. Which of the following types of graphs
should NOT be used to display information concerning the students parking times? -
ANSWER: pie chart
A large state university conducted a survey among their students and received 300
responses. The survey asked the students to provide the following information:*
Age* Year in School (Freshman, Sophomore, Junior, Senior)* Gender* GPA -
ANSWER: A histogram because Age is a numerical variable.
The two histograms below display the exact same data. How do the plots differ? -
ANSWER: Histogram (i) uses relative frequencies to show the proportion of
observations at a given value. Histogram (ii) uses frequencies to simply count the
number of observations at a given value.
In a survey, high school graduates were asked "Did you play sports in high school?"
The response was electronically recorded as a "1" for yes and a "0" for no. This is an
example of . - ANSWER: coded categorical data
In a survey, married couples were asked, "Do you have children?" The response was
electronically recorded as a "1" for yes and a "0" for no. This is an example of . -
ANSWER: Coded categorical data
In a study of 900 adults, 45 out of the 325 men in the study said that they preferred
to rent a movie on DVD rather than going out to a movie theater.What is the
approximate percentage of men in this study who prefer to rent a movie on DVD? -
ANSWER: 13.8%
,In a study of 1350 elementary school children, 118 out of the 615 girls in the study
said they want to be a teacher when they grow up.What percent of girls want to be a
teacher when they grow up? - ANSWER: 19.2%
The histogram below shows the distribution of pass rates on a swimming test taken
by all children who completed a four week summer swim course at the local YMCA.
What is the typical pass rate for the swim test? - ANSWER: about 75%
Marital status of each member of a randomly selected group of adults is an example
of what type of variable? - ANSWER: categorical variable
The number of parents who attended parent teacher conferences at a local
elementary school is an example of what type of variable? - ANSWER: numerical
variable
A group of 500 patients who suffer from hypothyroidism, a condition in which your
thyroid does not produce enough of certain hormones, were asked to participate in
a study to determine the effectiveness of a new medication. The patients were
randomly divided into two groups, one that was given the actual medication, and
one that received a placebo pill. The results of the study are below.
Was the new medication effective in treating hypothyroidism? - ANSWER: Yes, a
higher percent of patients who took the medication had improved symptoms than
the patients who took the placebo.
Which of the following would likely show a bimodal distribution in a histogram? -
ANSWER: The heights of all students in a high school band.
A doctor is interested in determining whether a certain medication increases the risk
of high blood pressure. He reviews his patients' medical records and finds that a
higher proportion of people who take the medication are suffering from high blood
pressure. - ANSWER: observational study
A group of students is divided into two groups. One group is a given a new chewable
vitamin and the other group is given a placebo. After six months they are asked to fill
out a questionnaire and given a health exam to see whether the new vitamin has
health benefits that are better than a placebo. - ANSWER: controlled experiment
A group of students is divided into two groups. One group listens to classical music
while taking a math test and the other group takes the test in silence. The average
test scores of the two groups are compared to see whether listening to music during
a math test has an effect on scores. - ANSWER: Controlled experiment
A group of cancer patients is divided into two groups. One group is given a new drug
to fight the side effects of chemotherapy and the other group is given a placebo.
After three months they are asked to respond to a questionnaire about the
, frequency and severity of their side effects to see whether the new drug improved
the overall negative side effects of chemotherapy. - ANSWER: Controlled experiment
The table gives the GPA and gender of students in a business class.Is the format of
the data set stacked or unstacked? - ANSWER: stacked
The table gives the GPA of some students in two math classes. One class meets in
the morning and one in the afternoon.
Is the format of the data set stacked or unstacked? - ANSWER: unstacked
A two-way table could be used for which of the following pairs of variables? -
ANSWER: gender and favorite class
A word cloud was created using the first chapter of John Green's The Fault in Our
Stars. (Note that filler words such as "the," "a/an," and "and" were excluded from
the plot.)
What information is NOT explicitly portrayed in the word cloud? - ANSWER: The
number of times each word occurs.
Consider the following statement, "In a nationwide study, children on an all-organic
diet are more alert in school than those not on an all-organic diet." Which of the
following is a plausible confounding variable in this study? - ANSWER: School start
times
The quality of the non-organic diet
Parents' social-economic status
Determine which of the following five variables are numerical and which are
categorical.
age, gender, weight, ethnicity, favorite math class - ANSWER: Age and weight are
numerical variables. Gender, ethnicity, and favorite math class are categorical
variables.
In a sample of 775 senior citizens, approximately 67% said that they had seen a
television commercial for life insurance. About how many senior citizens is this? -
ANSWER: 519
Data was collected on hand grip strength of adults. The histogram below summarizes
the data. Which statement is true about the distribution of the data shown in the
graph? - ANSWER: The graph shows evidence that two different groups may have
been combined into one collection.
A gym is offering a new 6-week diet plan for its members. Members who sign up for
the program are weighed and measured once a week for the duration of the
program. The owners of the gym want to know if the diet plan actually helps people
