STATISTICS: KEY CONCEPTS, VARIABLES,
SAMPLING, AND DATA ORGANIZATION
| PRACTICE QUESTIONS AND DETAILED
ANSWERS | GRADED A+ |
GUARANTEED SUCCESS
Updated 2026 Questions and Answers | 100% Verified
Exam Prep
, What is statistics? Science of collecting, organizing, summarizing, analyzing, and interpreting data.
What is the main purpose of statistics? To use data to answer questions and make decisions.
What is a population? The entire group of interest.
What is a sample? A subset of a population.
Why do researchers use a sample instead of a population? It is faster, cheaper, and represents the population.
What is descriptive statistics? Summarizes and organizes data using tables, graphs, and numerical measures.
What is inferential statistics? Uses a sample to draw conclusions about a population.
What does a statistician help determine before a study? The study design and sample size.
Why is sample size important? To reduce study errors and improve accuracy.
What are common sources of data? Surveys, experiments, hospitals, government, companies, and surveillance systems.
What is a survey? Data collected without controlling variables.
What is an experiment? A study where researchers control treatments or conditions.
What is a retrospective study? A study that looks at past data (case-control study).
What is a prospective study? A study that follows healthy people over time (cohort study).
SAMPLING, AND DATA ORGANIZATION
| PRACTICE QUESTIONS AND DETAILED
ANSWERS | GRADED A+ |
GUARANTEED SUCCESS
Updated 2026 Questions and Answers | 100% Verified
Exam Prep
, What is statistics? Science of collecting, organizing, summarizing, analyzing, and interpreting data.
What is the main purpose of statistics? To use data to answer questions and make decisions.
What is a population? The entire group of interest.
What is a sample? A subset of a population.
Why do researchers use a sample instead of a population? It is faster, cheaper, and represents the population.
What is descriptive statistics? Summarizes and organizes data using tables, graphs, and numerical measures.
What is inferential statistics? Uses a sample to draw conclusions about a population.
What does a statistician help determine before a study? The study design and sample size.
Why is sample size important? To reduce study errors and improve accuracy.
What are common sources of data? Surveys, experiments, hospitals, government, companies, and surveillance systems.
What is a survey? Data collected without controlling variables.
What is an experiment? A study where researchers control treatments or conditions.
What is a retrospective study? A study that looks at past data (case-control study).
What is a prospective study? A study that follows healthy people over time (cohort study).
