Byu Stats 121 Exam 1 Updated Actual Questions And Correct Answers

BYU STATS 121 EXAM 1 UPDATED ACTUAL
QUESTIONS AND CORRECT ANSWERS
Question:
BYU STATS 121 EXAM 1 UPDATED
CORRECT ANSWERS
Effort to reduce effects of lurking variables
Control
1
Replication
3




Answer:
ACTUAL QUESTIONS AND
Description

, 2
Prediction
4

Question:
The purpose of statistics
Answer:
To answer questions despite uncertainty. Statistics is a science, art and
methodology for obtaining information and drawing valid conclusions. Statistical
methods allow us to do this using data collected from just a subset of the
population

Question:
4 big components of statistics
Answer:
1. Population
2. Variable
3. Individual
4. Sample

Question:
Difference between population and sample
Answer:
Population: the entire group that we're interested in
Sample: the group we obtained information from

Question:
Quantitative vs Categorical
Answer:
Quantitative: variable whose possible values are meaningful numbers, ex: cost
Categorical: variables whose possible values are non-quantitative categories, ex:
gender

Question:
Exploratory Data Analysis
Answer:
- organize and summarize data
- discover: features, patterns, striking
deviations from patterns
- interpret patterns in context
- single variable patterns (distribution) and two
variable patterns (relationship)
- visual displays and numerical summaries

Question:
3 types of non-probability sampling
Answer: