Question 1

Which of the following best describes the main purpose of statistics as discussed in the study materials?

Accepted Answer

To provide a way of reasoning and a collection of tools to help us understand variation and make decisions with incomplete information.

Question 2

A researcher wants to know the average height of all college students in the United States. Since measuring everyone is impractical, she measures the height of 500 randomly selected students. In this scenario, what is the population?

Accepted Answer

All college students in the United States.

Question 3

Which of the following is an example of a categorical variable?

Accepted Answer

Favorite coffee flavor at Starbucks

Question 4

Which of the following variables is best classified as ordinal?

Accepted Answer

Military rank (Private, Corporal, Sergeant, etc.)

Question 5

Why is it important to provide context for data?

Accepted Answer

Because data without context can be misinterpreted or meaningless.

Question 6

Which of the following is NOT a reason why real data can be 'messy'?

Accepted Answer

All data is always perfectly clean and consistent.

Question 7

A variable records the number of countries a person has visited. What type of variable is this?

Accepted Answer

Quantitative

Question 8

Which of the following is an identifier variable?

Accepted Answer

Social Security Number

Question 9

Why do statisticians use randomness when selecting a sample?

Accepted Answer

To ensure the sample is representative of the population.

Question 10

Which of the following best describes a random event?

Accepted Answer

An event where knowing the outcome of one event tells you nothing about the next, and the possible outcomes are known.

Question 11

A simulation is used to estimate the number of jobs created due to changes in interest rates. Why might a simulation be necessary in this case?

Accepted Answer

Because the exact answer is too complex or impossible to determine.

Question 12

Which of the following is a quantitative variable?

Accepted Answer

Income in dollars

Question 13

Suppose you are designing a survey to collect data on shoe size. Which of the following is a potential problem you should consider?

Accepted Answer

Respondents may use different units (US, UK, EU sizes).

Question 14

Which of the following best explains why not all data represented by numbers are considered numerical data?

Accepted Answer

Some numbers are used as labels for categories, not as quantities.

Question 15

A dataset includes the following columns: Order Number, Name, State/Country, Price, Area Code, Download, Gift?, ASIN, Artist. Which variable is most likely to be an identifier?

Accepted Answer

Order Number

Question 16

Which of the following best describes the difference between a sample and a population?

Accepted Answer

A sample is a subset of the population used to make inferences about the population.

Question 17

Suppose you are analyzing survey data and notice that some responses are missing. What is this issue called?

Accepted Answer

Non-response

Question 18

Which of the following is an example of using randomness to simulate reality?

Accepted Answer

Using a computer to generate random numbers to model weather conditions for aircraft landings.

Question 19

Which of the following is NOT one of the 'W’s' needed to provide context for data?

Accepted Answer

Which

Question 20

A researcher encodes gender as 1 for male and 2 for female in a dataset. What type of variable is gender in this context?

Accepted Answer

Categorical

Chapter 1: Introduction to Statistics and Data

Guida di studio - Domande di pratica

Study guide - Flashcard