Statistics: Key Concepts
for Data Analysis & Graphs
– Study Guide, Review &
Practice Questions
Updated Questions and Answers
100% Verified Exam Prep and Comprehensive
Rationales
Included
, What is a statistical investigative question? A question that anticipates variability in the answers and can be answered by
collecting and analyzing data.
How do you recognize a valid statistical investigative It asks about a group, expects answers to vary, and can be answered with data.
question?
What is the population in research? The entire group of individuals or items that researchers want information about.
What is a census? A study that collects data from every individual or item in the population.
What is a sample? A subset of the population from which data are actually collected.
Why use a sample instead of a census? A sample is usually faster, cheaper, and more practical; a census may be
impossible or take too long.
How do you identify the population? Ask: What entire group does the researcher want to draw a conclusion about?
How do you identify the sample? Ask: Which individuals or items were actually measured, surveyed, tested, or
observed?
What notation is used for sample size? The sample size is written as n.
What notation is used for population size? The population size is written as N.
What is a parameter? A number that describes a characteristic of a population.
What is a statistic? A number that describes a characteristic of a sample.
for Data Analysis & Graphs
– Study Guide, Review &
Practice Questions
Updated Questions and Answers
100% Verified Exam Prep and Comprehensive
Rationales
Included
, What is a statistical investigative question? A question that anticipates variability in the answers and can be answered by
collecting and analyzing data.
How do you recognize a valid statistical investigative It asks about a group, expects answers to vary, and can be answered with data.
question?
What is the population in research? The entire group of individuals or items that researchers want information about.
What is a census? A study that collects data from every individual or item in the population.
What is a sample? A subset of the population from which data are actually collected.
Why use a sample instead of a census? A sample is usually faster, cheaper, and more practical; a census may be
impossible or take too long.
How do you identify the population? Ask: What entire group does the researcher want to draw a conclusion about?
How do you identify the sample? Ask: Which individuals or items were actually measured, surveyed, tested, or
observed?
What notation is used for sample size? The sample size is written as n.
What notation is used for population size? The population size is written as N.
What is a parameter? A number that describes a characteristic of a population.
What is a statistic? A number that describes a characteristic of a sample.
