INTRODUCTION TO STATISTICS
PROBABILITY THEORY AND RANDOM
VARIABLES QUESTION BANK 2026
◉ Survey/Sample Survey
Answer: A data collection tool that individuals in a study can fill out
and return to the researcher.
◉ Variables of Interest
Answer: The variables the survey wishes to measure about those
taking the survey.
◉ Survey Design
Answer: The way the survey is set up. This deals with the wording of
questions and answer choices.
◉ Blinding
Answer: The practice of making sure that certain individuals do not
know which subjects are receiving which
treatment.
◉ Double-blind experiments
, Answer: An experiment where neither the subjects nor anyone in
contact with them has any knowledge of which
subjects are receiving which treatment.
◉ Single-blind experiments
Answer: An experiment where either the subjects have no
knowledge of which subjects are receiving which treatment or
people in contact with the subjects have no knowledge of which
subjects are receiving which treatment, but not both.
◉ Placebo
Answer: An inert drug or treatment given to the control group. It has
no active ingredient in it.
◉ Placebo Effect
Answer: The observed phenomenon whereby certain individuals
will exhibit a desired response even when taking a placebo, which
contains no active ingredient.
◉ Variable
Answer: Any attribute or number that can be measured about
individuals in a study.
PROBABILITY THEORY AND RANDOM
VARIABLES QUESTION BANK 2026
◉ Survey/Sample Survey
Answer: A data collection tool that individuals in a study can fill out
and return to the researcher.
◉ Variables of Interest
Answer: The variables the survey wishes to measure about those
taking the survey.
◉ Survey Design
Answer: The way the survey is set up. This deals with the wording of
questions and answer choices.
◉ Blinding
Answer: The practice of making sure that certain individuals do not
know which subjects are receiving which
treatment.
◉ Double-blind experiments
, Answer: An experiment where neither the subjects nor anyone in
contact with them has any knowledge of which
subjects are receiving which treatment.
◉ Single-blind experiments
Answer: An experiment where either the subjects have no
knowledge of which subjects are receiving which treatment or
people in contact with the subjects have no knowledge of which
subjects are receiving which treatment, but not both.
◉ Placebo
Answer: An inert drug or treatment given to the control group. It has
no active ingredient in it.
◉ Placebo Effect
Answer: The observed phenomenon whereby certain individuals
will exhibit a desired response even when taking a placebo, which
contains no active ingredient.
◉ Variable
Answer: Any attribute or number that can be measured about
individuals in a study.
