Introduction to Statistics Unit 1: Milestone 1 Exam Questions With Correct Answers
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Course
Statistics
Institution
Statistics
Introduction to Statistics Unit 1: Milestone 1
Exam Questions With Correct Answers
Which of these statements best defines a stratified random sample? - answerIt is a sample where the
population is first broken into groups and then elements are randomly selected, in proportion, from
each group.
...
Introduction to Statistics Unit 1: Milestone 1
Exam Questions With Correct Answers
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.
Which of the following explains why there is a difference between the two percentages? -
answer✔Random error; the numbers were different due to variability inherent in sampling.
Rob sent an email survey to 2,000 cell phone owners asking about their satisfaction with their current
plan. Only 256 people returned the survey and they were predominately 18-24 years old.
Which of the following statements is true? - answer✔The survey likely has bias because the people who
could not answer differ from those who did answer.
Regan wants to study how reading on a computer affects comprehension among elementary school
students. Regan thinks that girls and boys might differ and he also suspects that grade level will affect
the results. He decides to create a male and female group for each grade. Within each group, he
randomly assigns half of the students to reads an article on paper and half of the students to read the
article on a computer.
Which type of experiment design does this situation illustrate? - answer✔Randomized Block.
A student group on a college campus wanted to create a survey about parking availability on campus.
The student group randomly selected 300 students to take the survey. One of the questions read, "Many
students believe the lack of availability parking is a major problem. Do you agree or disagree?" Or the
300 students that took the survey, 285 surveys were returned.
This survey will most likely suffer from which of the following types of bias? - answer✔Response Bias
A poll was conducted two weeks before an election and showed that the incumbent would win with
54% of the vote and a margin of error of 3%.
What is the confidence interval for this poll? - answer✔51% to 57%
In looking to determine the proportion of students who enjoy science, which of the following might be a
representative sample to take? - answer✔30 students in the lunchroom.
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