Introduction To Statistics Unit 1: Milestone 1 &
Unit 2- Milestone 2 Introduction to Statistics/
Answered Exam Questions.
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 pizza owner asked 50 customers to taste a new type of topping and found that 40 people liked
its taste.
Which of these is an example of descriptive statistics? - Answer: 80% of the surveyed customers
like the taste of the pizza topping.
Page 1 of 12
, A factory manufactures motorcycles. One of its employees, working in the quality control
department, checks the first 10 and the last 10 motorcycles manufactured in a day.
This is what type of sampling? - Answer: Convenience sampling.
A retail brand plans to open its stores across all cities with a population of more than one
million. To prepare for this, it refers to the past year's census done by the government.
Which statement accurately describes the type of data the retail brand is using? - Answer: The
census is an example of available data because the government provides it.
A new pet food product for small dogs has been developed to help with tooth decay. Fifty-two
dogs participate in the study. Each dog owner picks a card from a standard deck out of a hat. If
the card is red, their dog will be in the treatment group. If the card is black, their dog will be in
the placebo group.
Which experimental design was used? - Answer: Completely Randomized Design.
The traffic volumes at a major intersection in New York were surveyed every day between one
and four in the afternoon for a month to study the traffic patterns in the city.
Which of the following types of bias affects the conclusions of the survey? - Answer: Selection
bias.
Scientist want to test a new pair of running shoes. A speed test is performed with two separate
groups of participants. The treatment group will wear the new pair of running shoes, while the
control group will not. It is believed that age and height may affect speed.
Page 2 of 12
Unit 2- Milestone 2 Introduction to Statistics/
Answered Exam Questions.
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 pizza owner asked 50 customers to taste a new type of topping and found that 40 people liked
its taste.
Which of these is an example of descriptive statistics? - Answer: 80% of the surveyed customers
like the taste of the pizza topping.
Page 1 of 12
, A factory manufactures motorcycles. One of its employees, working in the quality control
department, checks the first 10 and the last 10 motorcycles manufactured in a day.
This is what type of sampling? - Answer: Convenience sampling.
A retail brand plans to open its stores across all cities with a population of more than one
million. To prepare for this, it refers to the past year's census done by the government.
Which statement accurately describes the type of data the retail brand is using? - Answer: The
census is an example of available data because the government provides it.
A new pet food product for small dogs has been developed to help with tooth decay. Fifty-two
dogs participate in the study. Each dog owner picks a card from a standard deck out of a hat. If
the card is red, their dog will be in the treatment group. If the card is black, their dog will be in
the placebo group.
Which experimental design was used? - Answer: Completely Randomized Design.
The traffic volumes at a major intersection in New York were surveyed every day between one
and four in the afternoon for a month to study the traffic patterns in the city.
Which of the following types of bias affects the conclusions of the survey? - Answer: Selection
bias.
Scientist want to test a new pair of running shoes. A speed test is performed with two separate
groups of participants. The treatment group will wear the new pair of running shoes, while the
control group will not. It is believed that age and height may affect speed.
Page 2 of 12
