SOPHIA STATISTICS UNIT 3 MILESTONE FINAL
PAPER 2026 QUESTIONS WITH COMPLETE
SOLUTIONS GRADED A+
Which of these statements best defines a stratified random sample?
Answer: It is a sample where the population is first broken into
groups and then elements are randomly selected, in proportion,
from each group.
◉ Which of the following data types will be continuous? Answer:
The amount of snow that fell last night.
◉ A study in which results are measured without intervention from
the researcher is called... Answer: Observational study.
◉ Which of the following best classifies the arrangement of bean
bags? Answer: Low accuracy and low precision.
◉ Mike wants to find out the approximate income for professors in
Michigan. He decides to randomly select 50 professors who work for
a college or university in Michigan and obtain their salaries.
, What are the sample and the population of Mike's study? Answer:
The 50 professors that Mike interviews are his sample, and all of the
professors who work in Michigan are the population.
◉ James conducts a survey to study the relationship between cell
phone use and grades earned during the fall semester. James
suspects that there might be a lot of other factors that affect grades
besides cell phones.
Which of the following could be a confounding variable in James's
study? Answer: Time spent studying.
◉ Cindy measured and recorded the temperature of a liquid for an
experiment. She used a poorly calibrated thermometer and noted
the temperature as 100.5 degrees Fahrenheit. The actual
temperature of the liquid was 95 degrees Fahrenheit.
The percent error in her calculation is... Answer: 5.79%
◉ On a candy production line, 3% of bags are overfilled. An
employee randomly selects 100 bags and finds that 5% are
overfilled. A second employee takes another random sample of 250
bags and finds that 2% are overfilled.
PAPER 2026 QUESTIONS WITH COMPLETE
SOLUTIONS GRADED A+
Which of these statements best defines a stratified random sample?
Answer: It is a sample where the population is first broken into
groups and then elements are randomly selected, in proportion,
from each group.
◉ Which of the following data types will be continuous? Answer:
The amount of snow that fell last night.
◉ A study in which results are measured without intervention from
the researcher is called... Answer: Observational study.
◉ Which of the following best classifies the arrangement of bean
bags? Answer: Low accuracy and low precision.
◉ Mike wants to find out the approximate income for professors in
Michigan. He decides to randomly select 50 professors who work for
a college or university in Michigan and obtain their salaries.
, What are the sample and the population of Mike's study? Answer:
The 50 professors that Mike interviews are his sample, and all of the
professors who work in Michigan are the population.
◉ James conducts a survey to study the relationship between cell
phone use and grades earned during the fall semester. James
suspects that there might be a lot of other factors that affect grades
besides cell phones.
Which of the following could be a confounding variable in James's
study? Answer: Time spent studying.
◉ Cindy measured and recorded the temperature of a liquid for an
experiment. She used a poorly calibrated thermometer and noted
the temperature as 100.5 degrees Fahrenheit. The actual
temperature of the liquid was 95 degrees Fahrenheit.
The percent error in her calculation is... Answer: 5.79%
◉ On a candy production line, 3% of bags are overfilled. An
employee randomly selects 100 bags and finds that 5% are
overfilled. A second employee takes another random sample of 250
bags and finds that 2% are overfilled.
