STAT 121: Exam #1 2025/2026 Exam
Questions with 100% Correct Answers |
Latest Update
What are the 4 steps in the Big Picture? - 🧠 ANSWER ✔✔1) Producing Data
2) Exploratory Data Analysis
3) Probability
4) Inference
What types of discipline is statistics? - 🧠 ANSWER ✔✔1) art
2) science
3) methodology
What do statiticians do with data in the statistics process? - 🧠 ANSWER ✔✔1)
collect data
2) summarize data
3) interpret data
1
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PRIVACY STATEMENT. ALL RIGHTS RESERVED
,T or F: Gallop has never been wrong in predicting the winner of a presiential
election? - 🧠 ANSWER ✔✔False
When does the process of statistics start? - 🧠 ANSWER ✔✔When the group we
want to study or learn something about is identified
What is "Population" in statistics? - 🧠 ANSWER ✔✔the entire group of individuals
What is "sample" in statistics? - 🧠 ANSWER ✔✔a subgroup of the population that
is being tested
What is meant by producing data? - 🧠 ANSWER ✔✔choosing a sample and
collecting data from it
Practice questions on pg. 10 in workbook - 🧠 ANSWER ✔✔
individual? - 🧠 ANSWER ✔✔entity observed
variable? - 🧠 ANSWER ✔✔characteristic or label (for values) that is measured for
each individual
quantitative vs. categorical variables? - 🧠 ANSWER ✔✔Quantitative: meaningful
numbers (have a value attached)
2
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PRIVACY STATEMENT. ALL RIGHTS RESERVED
,Categorical: no value attached
measurement? - 🧠 ANSWER ✔✔value of a variable
T or F: Never take a quantitative variable and make it into a categorical variable? -
🧠 ANSWER ✔✔TRUE
What are the 2 parts of distribution of a variable? - 🧠 ANSWER ✔✔summary of
data one variable at a time
1) all values of variable
2) how often occur
What does the distribution of textbook costs tell you?
a) who the students were
b) how the students were selected
c) that the costs were measured in dollars
d) how frequently the various costs occurred in the data set - 🧠 ANSWER ✔✔d)
how frequently the various costs occurred in the data set
3
COPYRIGHT@SARAHROSAPERAL 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
PRIVACY STATEMENT. ALL RIGHTS RESERVED
, What are the components of an exploratory data analysis? - 🧠 ANSWER ✔✔-
ORGANIZE and summarize data
-DISCOVER: features, patterns, striking deviations from patterns
-INTERPRET patterns in context
-Single variable patterns (distribution) and 2 variable patterns (relationship)
-Visual displays and numerical summaries (communicates more info)
What is a definition ? - 🧠 ANSWER ✔✔a types of observational study in which
individuals report variables' values themselves, frequently by giving their opinions
What is purpose? - 🧠 ANSWER ✔✔sample fact in place of population fact (take
what know about the sample and determine the population)
What is the population in the potato example?
a) all potatoes in the world
b) all potatoes in the U.S.
c) all potatoes in the truckload
d) all potatoes in the buckets - 🧠 ANSWER ✔✔c) all potatoes in the truckload
What is the variable? - 🧠 ANSWER ✔✔characteristic that is measured
4
COPYRIGHT@SARAHROSAPERAL 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
PRIVACY STATEMENT. ALL RIGHTS RESERVED
Questions with 100% Correct Answers |
Latest Update
What are the 4 steps in the Big Picture? - 🧠 ANSWER ✔✔1) Producing Data
2) Exploratory Data Analysis
3) Probability
4) Inference
What types of discipline is statistics? - 🧠 ANSWER ✔✔1) art
2) science
3) methodology
What do statiticians do with data in the statistics process? - 🧠 ANSWER ✔✔1)
collect data
2) summarize data
3) interpret data
1
COPYRIGHT@SARAHROSAPERAL 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
PRIVACY STATEMENT. ALL RIGHTS RESERVED
,T or F: Gallop has never been wrong in predicting the winner of a presiential
election? - 🧠 ANSWER ✔✔False
When does the process of statistics start? - 🧠 ANSWER ✔✔When the group we
want to study or learn something about is identified
What is "Population" in statistics? - 🧠 ANSWER ✔✔the entire group of individuals
What is "sample" in statistics? - 🧠 ANSWER ✔✔a subgroup of the population that
is being tested
What is meant by producing data? - 🧠 ANSWER ✔✔choosing a sample and
collecting data from it
Practice questions on pg. 10 in workbook - 🧠 ANSWER ✔✔
individual? - 🧠 ANSWER ✔✔entity observed
variable? - 🧠 ANSWER ✔✔characteristic or label (for values) that is measured for
each individual
quantitative vs. categorical variables? - 🧠 ANSWER ✔✔Quantitative: meaningful
numbers (have a value attached)
2
COPYRIGHT@SARAHROSAPERAL 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
PRIVACY STATEMENT. ALL RIGHTS RESERVED
,Categorical: no value attached
measurement? - 🧠 ANSWER ✔✔value of a variable
T or F: Never take a quantitative variable and make it into a categorical variable? -
🧠 ANSWER ✔✔TRUE
What are the 2 parts of distribution of a variable? - 🧠 ANSWER ✔✔summary of
data one variable at a time
1) all values of variable
2) how often occur
What does the distribution of textbook costs tell you?
a) who the students were
b) how the students were selected
c) that the costs were measured in dollars
d) how frequently the various costs occurred in the data set - 🧠 ANSWER ✔✔d)
how frequently the various costs occurred in the data set
3
COPYRIGHT@SARAHROSAPERAL 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
PRIVACY STATEMENT. ALL RIGHTS RESERVED
, What are the components of an exploratory data analysis? - 🧠 ANSWER ✔✔-
ORGANIZE and summarize data
-DISCOVER: features, patterns, striking deviations from patterns
-INTERPRET patterns in context
-Single variable patterns (distribution) and 2 variable patterns (relationship)
-Visual displays and numerical summaries (communicates more info)
What is a definition ? - 🧠 ANSWER ✔✔a types of observational study in which
individuals report variables' values themselves, frequently by giving their opinions
What is purpose? - 🧠 ANSWER ✔✔sample fact in place of population fact (take
what know about the sample and determine the population)
What is the population in the potato example?
a) all potatoes in the world
b) all potatoes in the U.S.
c) all potatoes in the truckload
d) all potatoes in the buckets - 🧠 ANSWER ✔✔c) all potatoes in the truckload
What is the variable? - 🧠 ANSWER ✔✔characteristic that is measured
4
COPYRIGHT@SARAHROSAPERAL 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
PRIVACY STATEMENT. ALL RIGHTS RESERVED
