STATS 121 EXAM 1 QUESTIONS WITH VERIFIED
ANSWERS
In a study of religious practices among U.S. college students, 127 students were
interviewed. Of those interviewed, 107 said that they pray at least once in a while. What
is the population? - Answers - All U.S. college students
In a study of religious practices among U.S. college students, 127 students were
interviewed. Of those interviewed, 107 said that they pray at least once in a while. What
is the sample? - Answers - The 127 students who were interviewed.
What type of variable is "country of origin"? - Answers - categorical
What type of variable is "volume of liquid"? - Answers - quantitative
What type of variable is "student ID number"? - Answers - categorical
To participate in the Time.com poll, go to the Time website and click. What kind of
sample is Time.com poll? - Answers - volunteer response
The IRS obtains a sample of Utah tax returns by taking a random sample of Utah
counties and then taking a random sample of returns filed in those counties. What kind
of sample is this? - Answers - multistage sample
200 students were assigned to teaching method A or B. The method A group was
taught by Dr. R. while the Method B group was taught by Dr. T. What kind of study is
this? - Answers - confounded study (happens when we can't tell whether differences
come from the explanatory variable or lurking variable(s)
In a famous study, 5200 patients were categorized into 2 groups according to their soda
habit. After 4 years of follow-up, the rate of heart disease was higher in the "regularly
drank" group than in the "sparingly drank" group. What kind of study is this? - Answers -
observational study
Which is better?
A random sample of size 400 or a nonrandom sample of 50,000 - Answers - A random
sample of size 400
When are credit quizzes due on Canvas? - Answers - before midnight according to the
quiz schedule
How can you earn extra credit in Stat 121? - Answers - By doing practice quizzes during
class
,and by doing student ratings
When do open labs start? - Answers - May 3rd
Where can you find the writing assignment instructions? - Answers - From their Canvas
assignment pages
Late Exams (after the exam has closed) will be subject to which of the following
penalties? - Answers - 20% score reduction for the first day, 10% penalty for each
additional day
Who should be contacted if
you had an emergency and missed a due date, or
you have an accommodations letter and need to adjust a deadline, or
you are an athlete/performer/etc. and will be traveling during a midterm? - Answers - the
course coordinator at
When can you see the correct answers for each Credit Quiz? - Answers - after the due
date
How quickly should you expect a response after sending an email the professors,
course coordinator, or TAs? - Answers - within two school days
No late credit quizzes or writing assignments will be accepted unless approved by the
Course Coordinator. - Answers - true
Which one of the following statements is true regarding credit quiz and assignment
scores? - Answers - The four lowest scores will be dropped from grade calculations
except Credit Quiz 01 and both writing assignments
What time do midterms close on the last day of the exam? - Answers - All exams close
at 4:00 PM MT on the last scheduled day of the exam.
The purpose of statistics is to convert data into useful information. - Answers - true
What does the statistical term "population" refer to? - Answers - It refers to the group we
want to study or learn something about
Researchers for the National Institute of Child Health and Human Development studied
208 infants whose brains were temporarily deprived of oxygen as a result of
complications at birth. These babies were subjects in an experiment to determine if
reducing body temperature for three days after birth improved their chances of surviving
without brain damage. What is the population? - Answers - All babies who were
temporarily deprived of oxygen as a result of complications at birth
, A student in Stat 121 wants to estimate the mean score on the Stat 121 final exam from
last semester. They asked 200 students who took the class last semester what their
final exam score was and recorded it. What is the sample? - Answers - The 200
students interviewed
What is the final step in the Big Picture of Statistics, as outlined in class? - Answers -
Inference
Which of the following is not part of the Big Picture of Statistics? - Answers - Publishing
data
A sample of 12th grade students who took the National Assessment of Education
Progress year 2000 mathematics test had a mean score of 250. What is the population?
- Answers - All 12th grade students who took the National Assessment of Educational
Progress year 2000 mathematics test
Researchers for the National Institute of Child Health and Human Development studied
208 infants whose brains were temporarily deprived of oxygen as a result of
complications at birth. These babies were subjects in an experiment to determine if
reducing body temperature for three days after birth improved their chances of surviving
without brain damage. What is the sample? - Answers - The 208 babies who were a
part of this experiment
Which of the following is a false statement about statistics? - Answers - Statistical
information is never misleading or misrepresented.
Which of the following is a categorical variable? - Answers - zip code
What is a false statement about stats? - Answers - statistical information is never
misleading or misrepresented
Probability is the process of drawing conclusions about the sample based on population
data. - Answers - false
The field of statistics ends once we have collected all of our data. - Answers - false
Which of these allow researchers to establish that the treatments "cause" changes in
the responses? - Answers - an experiment
In an experiment, subjects choose their treatment. - Answers - false
We can establish causation whenever a random sample is taken - Answers - false
Which of the following describes confounding? - Answers - A condition where the effect
of one variable on the response variable cannot be separated from the effect of another
variable.
ANSWERS
In a study of religious practices among U.S. college students, 127 students were
interviewed. Of those interviewed, 107 said that they pray at least once in a while. What
is the population? - Answers - All U.S. college students
In a study of religious practices among U.S. college students, 127 students were
interviewed. Of those interviewed, 107 said that they pray at least once in a while. What
is the sample? - Answers - The 127 students who were interviewed.
What type of variable is "country of origin"? - Answers - categorical
What type of variable is "volume of liquid"? - Answers - quantitative
What type of variable is "student ID number"? - Answers - categorical
To participate in the Time.com poll, go to the Time website and click. What kind of
sample is Time.com poll? - Answers - volunteer response
The IRS obtains a sample of Utah tax returns by taking a random sample of Utah
counties and then taking a random sample of returns filed in those counties. What kind
of sample is this? - Answers - multistage sample
200 students were assigned to teaching method A or B. The method A group was
taught by Dr. R. while the Method B group was taught by Dr. T. What kind of study is
this? - Answers - confounded study (happens when we can't tell whether differences
come from the explanatory variable or lurking variable(s)
In a famous study, 5200 patients were categorized into 2 groups according to their soda
habit. After 4 years of follow-up, the rate of heart disease was higher in the "regularly
drank" group than in the "sparingly drank" group. What kind of study is this? - Answers -
observational study
Which is better?
A random sample of size 400 or a nonrandom sample of 50,000 - Answers - A random
sample of size 400
When are credit quizzes due on Canvas? - Answers - before midnight according to the
quiz schedule
How can you earn extra credit in Stat 121? - Answers - By doing practice quizzes during
class
,and by doing student ratings
When do open labs start? - Answers - May 3rd
Where can you find the writing assignment instructions? - Answers - From their Canvas
assignment pages
Late Exams (after the exam has closed) will be subject to which of the following
penalties? - Answers - 20% score reduction for the first day, 10% penalty for each
additional day
Who should be contacted if
you had an emergency and missed a due date, or
you have an accommodations letter and need to adjust a deadline, or
you are an athlete/performer/etc. and will be traveling during a midterm? - Answers - the
course coordinator at
When can you see the correct answers for each Credit Quiz? - Answers - after the due
date
How quickly should you expect a response after sending an email the professors,
course coordinator, or TAs? - Answers - within two school days
No late credit quizzes or writing assignments will be accepted unless approved by the
Course Coordinator. - Answers - true
Which one of the following statements is true regarding credit quiz and assignment
scores? - Answers - The four lowest scores will be dropped from grade calculations
except Credit Quiz 01 and both writing assignments
What time do midterms close on the last day of the exam? - Answers - All exams close
at 4:00 PM MT on the last scheduled day of the exam.
The purpose of statistics is to convert data into useful information. - Answers - true
What does the statistical term "population" refer to? - Answers - It refers to the group we
want to study or learn something about
Researchers for the National Institute of Child Health and Human Development studied
208 infants whose brains were temporarily deprived of oxygen as a result of
complications at birth. These babies were subjects in an experiment to determine if
reducing body temperature for three days after birth improved their chances of surviving
without brain damage. What is the population? - Answers - All babies who were
temporarily deprived of oxygen as a result of complications at birth
, A student in Stat 121 wants to estimate the mean score on the Stat 121 final exam from
last semester. They asked 200 students who took the class last semester what their
final exam score was and recorded it. What is the sample? - Answers - The 200
students interviewed
What is the final step in the Big Picture of Statistics, as outlined in class? - Answers -
Inference
Which of the following is not part of the Big Picture of Statistics? - Answers - Publishing
data
A sample of 12th grade students who took the National Assessment of Education
Progress year 2000 mathematics test had a mean score of 250. What is the population?
- Answers - All 12th grade students who took the National Assessment of Educational
Progress year 2000 mathematics test
Researchers for the National Institute of Child Health and Human Development studied
208 infants whose brains were temporarily deprived of oxygen as a result of
complications at birth. These babies were subjects in an experiment to determine if
reducing body temperature for three days after birth improved their chances of surviving
without brain damage. What is the sample? - Answers - The 208 babies who were a
part of this experiment
Which of the following is a false statement about statistics? - Answers - Statistical
information is never misleading or misrepresented.
Which of the following is a categorical variable? - Answers - zip code
What is a false statement about stats? - Answers - statistical information is never
misleading or misrepresented
Probability is the process of drawing conclusions about the sample based on population
data. - Answers - false
The field of statistics ends once we have collected all of our data. - Answers - false
Which of these allow researchers to establish that the treatments "cause" changes in
the responses? - Answers - an experiment
In an experiment, subjects choose their treatment. - Answers - false
We can establish causation whenever a random sample is taken - Answers - false
Which of the following describes confounding? - Answers - A condition where the effect
of one variable on the response variable cannot be separated from the effect of another
variable.
