BIS 245 WEEK 3 ILAB EXAM SCRIPT 2026
COMPLETE QUESTIONS SOLUTIONS GRADED
A+
◉ Sample. Answer: A subset of the population, selected for study.
◉ Variable. Answer: A characteristic or property that can take on
different values for different individuals.
◉ Observational Study. Answer: Researchers observe and record
data without intervening.
◉ Experimental Study. Answer: Researchers impose a treatment to
observe its effect.
◉ Bias. Answer: Systematic favoritism of certain outcomes over
others in a study.
◉ Convenience Sample. Answer: Choosing individuals who are
easiest to reach; often biased.
◉ Voluntary Response Sample. Answer: Individuals choose
themselves to participate, often leading to bias.
, ◉ Simple Random Sample (SRS). Answer: Every individual and
every possible sample has an equal chance of being selected.
◉ Sampling Frame. Answer: The list from which a sample is actually
selected.
◉ Table of Random Digits. Answer: A tool used to select random
samples, where each digit is equally likely and independent of other
digits.
◉ Parameter. Answer: A number that describes a population (often
unknown in practice).
◉ Statistic. Answer: A number that describes a sample; used to
estimate population parameters.
◉ Sampling Variability. Answer: The idea that statistics can vary
from sample to sample.
◉ Bias (Sampling). Answer: Systematic deviation of a statistic from
the parameter in the same direction.
COMPLETE QUESTIONS SOLUTIONS GRADED
A+
◉ Sample. Answer: A subset of the population, selected for study.
◉ Variable. Answer: A characteristic or property that can take on
different values for different individuals.
◉ Observational Study. Answer: Researchers observe and record
data without intervening.
◉ Experimental Study. Answer: Researchers impose a treatment to
observe its effect.
◉ Bias. Answer: Systematic favoritism of certain outcomes over
others in a study.
◉ Convenience Sample. Answer: Choosing individuals who are
easiest to reach; often biased.
◉ Voluntary Response Sample. Answer: Individuals choose
themselves to participate, often leading to bias.
, ◉ Simple Random Sample (SRS). Answer: Every individual and
every possible sample has an equal chance of being selected.
◉ Sampling Frame. Answer: The list from which a sample is actually
selected.
◉ Table of Random Digits. Answer: A tool used to select random
samples, where each digit is equally likely and independent of other
digits.
◉ Parameter. Answer: A number that describes a population (often
unknown in practice).
◉ Statistic. Answer: A number that describes a sample; used to
estimate population parameters.
◉ Sampling Variability. Answer: The idea that statistics can vary
from sample to sample.
◉ Bias (Sampling). Answer: Systematic deviation of a statistic from
the parameter in the same direction.
