INTRO TO STATISTICS Q & A
Intro to
statistics Unit 1
Challenge 1
1. A survey on Internet usage was conducted among a group of 200 students in
the school cafeteria. It was found that 100 students spend at least two hours
online every day. Which of these is an example of descriptive statistics?
A: 50% of the students surveyed spend at least two hours online each day.
2. If numbers collected from a survey are measurements, what are these
measurements called before you perform any calculations?
A: raw data
3. Select the two categories that would yield quantitative
data. A: Age of pet, Weight of pet
4. Which of these data sets represent discrete data?
A: Number of questions answered incorrectly in a multiple-
choice quiz Challenge 2
1. A production company is interested in collecting information on the impact of an
educational documentary on everyone that watched it at the film festival.
Which statement is true?
A: The group of people that watched the documentary at the festival represents the population.
2. Which of these random samples qualifies as a representative sample if studying the
opinion of people who use online shopping websites?
A: Consumers who order products online
3. Which of these is an example of systematic random sample?
, INTRO TO STATISTICS Q & A
A: Picking out the telephone number of every 20th person from a directory.
4. Which of these statements best defines a stratified random sample?
A: It is a sample where the population is first broken into homogenous groups and
then elements are randomly selected, in proportion, from each group.
5. Which of these is an example of multi-stage sampling?
A: Choosing New York as a sample, then selecting a sample of zip codes within New
York, then sampling the names of people living in those zip codes.
Challenge 3
1. Select the statement that expresses an approach used with observational studies.
A: "We took all those notes. We recorded customer counts, menus, food prices, even
the general atmosphere of the food truck environment."
2. Which of these situations best describes a retrospective observational
study? A: A doctor analyzing the medical history of a person.
3. Analyzing the results of rolling a fair die 100 times refers to which of these
principles? A: Replication
4. Which of these statements is true regarding a randomized block design experiment?
A: Random allocation of treatment and control groups is done within the divided groups.
, INTRO TO STATISTICS Q & A
5. Select the TRUE statement for completely random design.
A: The experimental units are assigned randomly to exactly one control group and one
or more treatment groups.
6. Which of these statements best describes a matched-pair design?
A: A design in which only two treatments are tested on pairs of similar subjects.
7. Which of the following is NOT an example of a survey?
A: A nutritionist is studying the relationship between eating carbohydrates and gaining
weight. The nutritionist recorded the diets and weights of 10 people for a year.
8. Which of these represents a blind experiment?
A: Asking a group of adults to compare the taste of coffee without revealing the
names of the brands.
9. By accident, Janae has been making decaffeinated coffee for her co-workers for the
entire week. But some of her co-workers have claimed that the extra boost of caffeine
has helped them focus on their work.
What does the placebo effect mean in this specific situation?
A: The benefit is due to the fact that the co-workers are given a "treatment" (coffee,
although decaffeinated) and not an effect of the "active ingredient" (caffeine).
Challenge 4
1. When Ben increases the temperature difference between two junctions, the
voltage also increases.
What type of variable is voltage in the above
situation? A: Response
2. Which of these represents a binomial
, INTRO TO STATISTICS Q & A
question? A: Do you own a rabbit?
3. Kendra reads in Modern Dog Magazine that the average age of dogs currently alive is 4.8
years. To determine if this finding applies to the customers in her pet store, Kendra surveys
every fifth customer in her store who owns a dog and asks the age of their dog. She collects
Week Average Age (in years)
data for seven weeks and 3.7
1 obtains the following averages.
2 3.8
3 4.2
4 4.1
5 3.9
6 3.9
7 4.0
Select the statement that is true about Kendra's
sample. A: Kendra's samples are precise but not
accurate.
Intro to
statistics Unit 1
Challenge 1
1. A survey on Internet usage was conducted among a group of 200 students in
the school cafeteria. It was found that 100 students spend at least two hours
online every day. Which of these is an example of descriptive statistics?
A: 50% of the students surveyed spend at least two hours online each day.
2. If numbers collected from a survey are measurements, what are these
measurements called before you perform any calculations?
A: raw data
3. Select the two categories that would yield quantitative
data. A: Age of pet, Weight of pet
4. Which of these data sets represent discrete data?
A: Number of questions answered incorrectly in a multiple-
choice quiz Challenge 2
1. A production company is interested in collecting information on the impact of an
educational documentary on everyone that watched it at the film festival.
Which statement is true?
A: The group of people that watched the documentary at the festival represents the population.
2. Which of these random samples qualifies as a representative sample if studying the
opinion of people who use online shopping websites?
A: Consumers who order products online
3. Which of these is an example of systematic random sample?
, INTRO TO STATISTICS Q & A
A: Picking out the telephone number of every 20th person from a directory.
4. Which of these statements best defines a stratified random sample?
A: It is a sample where the population is first broken into homogenous groups and
then elements are randomly selected, in proportion, from each group.
5. Which of these is an example of multi-stage sampling?
A: Choosing New York as a sample, then selecting a sample of zip codes within New
York, then sampling the names of people living in those zip codes.
Challenge 3
1. Select the statement that expresses an approach used with observational studies.
A: "We took all those notes. We recorded customer counts, menus, food prices, even
the general atmosphere of the food truck environment."
2. Which of these situations best describes a retrospective observational
study? A: A doctor analyzing the medical history of a person.
3. Analyzing the results of rolling a fair die 100 times refers to which of these
principles? A: Replication
4. Which of these statements is true regarding a randomized block design experiment?
A: Random allocation of treatment and control groups is done within the divided groups.
, INTRO TO STATISTICS Q & A
5. Select the TRUE statement for completely random design.
A: The experimental units are assigned randomly to exactly one control group and one
or more treatment groups.
6. Which of these statements best describes a matched-pair design?
A: A design in which only two treatments are tested on pairs of similar subjects.
7. Which of the following is NOT an example of a survey?
A: A nutritionist is studying the relationship between eating carbohydrates and gaining
weight. The nutritionist recorded the diets and weights of 10 people for a year.
8. Which of these represents a blind experiment?
A: Asking a group of adults to compare the taste of coffee without revealing the
names of the brands.
9. By accident, Janae has been making decaffeinated coffee for her co-workers for the
entire week. But some of her co-workers have claimed that the extra boost of caffeine
has helped them focus on their work.
What does the placebo effect mean in this specific situation?
A: The benefit is due to the fact that the co-workers are given a "treatment" (coffee,
although decaffeinated) and not an effect of the "active ingredient" (caffeine).
Challenge 4
1. When Ben increases the temperature difference between two junctions, the
voltage also increases.
What type of variable is voltage in the above
situation? A: Response
2. Which of these represents a binomial
, INTRO TO STATISTICS Q & A
question? A: Do you own a rabbit?
3. Kendra reads in Modern Dog Magazine that the average age of dogs currently alive is 4.8
years. To determine if this finding applies to the customers in her pet store, Kendra surveys
every fifth customer in her store who owns a dog and asks the age of their dog. She collects
Week Average Age (in years)
data for seven weeks and 3.7
1 obtains the following averages.
2 3.8
3 4.2
4 4.1
5 3.9
6 3.9
7 4.0
Select the statement that is true about Kendra's
sample. A: Kendra's samples are precise but not
accurate.
