Introduction to Statistics Unit 1: Exam Test with Answers!!
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Course
Introduction to Statistics
Institution
Introduction To Statistics
Introduction to Statistics Unit 1: Exam Test with Answers!!
1. Which of these statements best defines a stratified
random sample?
It is a sample
where the popu-
lation is first bro-
ken into groups
and then elements
are randomly se-
lected, in propor-
tion, from each
group
Introduction to Statistics Unit 1: Exam Test with Answers!!
1. Which of these statements best defines a stratified It is a sample
random sample? where the popu-
lation is first bro-
ken into groups
and then elements
are randomly se-
lected, in propor-
tion, from each
group.
2. Which of the following data types will be continuous? The amount of
snow that fell last
night.
3. A study in which results are measured without inter- Observational
vention from the researcher is called... study.
4. Which of the following best classifies the arrangement Low accuracy and
of bean bags? low precision.
5. Mike wants to find out the approximate income for The 50 profes-
professors in Michigan. He decides to randomly select sors that Mike in-
50 professors who work for a college or university in terviews are his
Michigan and obtain their salaries. sample, and all
of the professors
What are the sample and the population of Mike's who work in Michi-
study? gan are the popu-
lation.
6. James conducts a survey to study the relationship Time spent study-
between cell phone use and grades earned during ing.
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 vari-
able in James's study?
1/6
, Introduction to Statistics Unit 1: Exam Test with Answers!!
7. Cindy measured and recorded the temperature of a 5.79%
liquid for an experiment. She used a poorly calibrated
thermometer and noted the temperature as 100.5 de-
grees Fahrenheit. The actual temperature of the liquid
was 95 degrees Fahrenheit.
The percent error in her calculation is...
8. On a candy production line, 3% of bags are overfilled. Random error; the
An employee randomly selects 100 bags and finds numbers were dif-
that 5% are overfilled. A second employee takes an- ferent due to vari-
other random sample of 250 bags and finds that 2% ability inherent in
are overfilled. sampling.
Which of the following explains why there is a differ-
ence between the two percentages?
9. Rob sent an email survey to 2,000 cell phone owners The survey likely
asking about their satisfaction with their current plan. has bias because
Only 256 people returned the survey and they were the people who
predominately 18-24 years old. could not answer
differ from those
Which of the following statements is true? who did answer.
10. Regan wants to study how reading on a computer Randomized
affects comprehension among elementary school stu- Block.
dents. Regan thinks that girls and boys might dif-
fer 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?
11. A student group on a college campus wanted to create Response Bias
a survey about parking availability on campus. The
student group randomly selected 300 students to take
2/6
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