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STAT 121: Exam #1 Questions and Correct
Answers/ Latest Update / Already Graded
What are the 4 steps in the Big Picture?
Ans: 1) Producing Data
2) Exploratory Data Analysis
3) Probability
4) Inference
What types of discipline is statistics?
Ans: 1) art
2) science
3) methodology
What do statiticians do with data in the statistics process?
Ans: 1) collect data
2) summarize data
3) interpret data
T or F: Gallop has never been wrong in predicting the winner of a
presiential election?
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Ans: False
When does the process of statistics start?
Ans: When the group we want to study or learn something
about is identified
What is "Population" in statistics?
Ans: the entire group of individuals
What is "sample" in statistics?
Ans: a subgroup of the population that is being tested
What is meant by producing data?
Ans: choosing a sample and collecting data from it
Practice questions on pg. 10 in workbook
Ans:
individual?
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Ans: entity observed
variable?
Ans: characteristic or label (for values) that is measured for
each individual
quantitative vs. categorical variables?
Ans: Quantitative: meaningful numbers (have a value attached)
Categorical: no value attached
measurement?
Ans: value of a variable
T or F: Never take a quantitative variable and make it into a categorical
variable?
Ans: TRUE
What are the 2 parts of distribution of a variable?
Ans: summary of data one variable at a time
All rights reserved © 2025/ 2026 |
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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
Ans: d) how frequently the various costs occurred in the data
set
What are the components of an exploratory data analysis?
Ans: -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)
All rights reserved © 2025/ 2026 |
STAT 121: Exam #1 Questions and Correct
Answers/ Latest Update / Already Graded
What are the 4 steps in the Big Picture?
Ans: 1) Producing Data
2) Exploratory Data Analysis
3) Probability
4) Inference
What types of discipline is statistics?
Ans: 1) art
2) science
3) methodology
What do statiticians do with data in the statistics process?
Ans: 1) collect data
2) summarize data
3) interpret data
T or F: Gallop has never been wrong in predicting the winner of a
presiential election?
All rights reserved © 2025/ 2026 |
, Page |2
Ans: False
When does the process of statistics start?
Ans: When the group we want to study or learn something
about is identified
What is "Population" in statistics?
Ans: the entire group of individuals
What is "sample" in statistics?
Ans: a subgroup of the population that is being tested
What is meant by producing data?
Ans: choosing a sample and collecting data from it
Practice questions on pg. 10 in workbook
Ans:
individual?
All rights reserved © 2025/ 2026 |
, Page |3
Ans: entity observed
variable?
Ans: characteristic or label (for values) that is measured for
each individual
quantitative vs. categorical variables?
Ans: Quantitative: meaningful numbers (have a value attached)
Categorical: no value attached
measurement?
Ans: value of a variable
T or F: Never take a quantitative variable and make it into a categorical
variable?
Ans: TRUE
What are the 2 parts of distribution of a variable?
Ans: summary of data one variable at a time
All rights reserved © 2025/ 2026 |
, Page |4
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
Ans: d) how frequently the various costs occurred in the data
set
What are the components of an exploratory data analysis?
Ans: -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)
All rights reserved © 2025/ 2026 |
