Introduction to Statistics Unit 1:
Milestone 1 Exam- Questions & Answers
Which of these statements best defines a stratified random sample? - -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? - -The amount of
snow that fell last night.
-A study in which results are measured without intervention from the
researcher is called... - -Observational study.
-Which of the following best classifies the arrangement of bean bags? - -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? - -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? - -
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... - -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? - -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? - -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? - -
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? -
-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? - -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? - -30 students in
the lunchroom.
-"Ugh," Daniel says as he notices an office memo on his desk. It had been a
fun weekend, and Monday morning came much too soon. He goes to the
kitchen to refill his coffee mug. On the way, he runs into Sean, who asks,
"How do you feel about the new office dress code?" - -Open question.
Milestone 1 Exam- Questions & Answers
Which of these statements best defines a stratified random sample? - -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? - -The amount of
snow that fell last night.
-A study in which results are measured without intervention from the
researcher is called... - -Observational study.
-Which of the following best classifies the arrangement of bean bags? - -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? - -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? - -
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... - -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? - -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? - -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? - -
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? -
-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? - -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? - -30 students in
the lunchroom.
-"Ugh," Daniel says as he notices an office memo on his desk. It had been a
fun weekend, and Monday morning came much too soon. He goes to the
kitchen to refill his coffee mug. On the way, he runs into Sean, who asks,
"How do you feel about the new office dress code?" - -Open question.
