Question 1

Which of the following best describes a 'variable' in the context of a data table?

Accepted Answer

A characteristic recorded about each case, usually represented as a column.

Question 2

A marketing manager collects data on customer spending before and after a promotional offer. Which of the following is the best example of a quantitative variable in this scenario?

Accepted Answer

The total spending on the card during the 3 months after the offer.

Question 3

Which of the following is NOT a characteristic of an identifier variable?

Accepted Answer

It has units that indicate measurement.

Question 4

A company collects data on the number of products sold each month for a year. This type of data is best described as:

Accepted Answer

Time series data

Question 5

Which of the following variables is most likely to be considered ordinal?

Accepted Answer

Customer satisfaction rated as 'Very Unsatisfied', 'Unsatisfied', 'Satisfied', 'Very Satisfied'

Question 6

In a relational database, what is the primary purpose of linking multiple data tables?

Accepted Answer

To merge information across different sets of cases using identifier variables.

Question 7

Which of the following best illustrates the importance of the 'when' in the context of data collection?

Accepted Answer

Data collected decades ago may not be comparable to data collected last year.

Question 8

A survey asks respondents to select their class standing: Freshman, Sophomore, Junior, or Senior. This variable is:

Accepted Answer

Ordinal

Question 9

Which of the following is a potential pitfall when classifying variables as categorical or quantitative?

Accepted Answer

Assuming a variable is quantitative just because its values are numbers.

Question 10

A researcher wants to know if a new medication improves recovery time. She randomly assigns patients to receive either the new medication or a placebo and measures their recovery times. This study is best described as:

Accepted Answer

A designed experiment

Question 11

Which of the following best describes metadata?

Accepted Answer

Information about how, when, and where the data were collected, and definitions of variables.

Question 12

A company wants to compare the average spending of customers before and after a marketing campaign. Which of the following best describes the 'cases' in this analysis?

Accepted Answer

The individual customers

Question 13

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

Accepted Answer

Type of advertising used: Internet, Newspapers, Direct mailings

Question 14

Why is it important to consider the 'why' when analyzing data?

Accepted Answer

It helps determine the appropriate statistical methods to use.

Question 15

A data set contains the following variables: Transaction Number, Date, Customer Number, Product ID, Quantity, Shipping Method, Free Shipping (Y/N). Which variable is most likely an identifier?

Accepted Answer

Transaction Number

Question 16

Which of the following statements about business analytics is correct?

Accepted Answer

It describes any use of statistical analysis to drive business decisions from data.

Question 17

A researcher collects data on the number of hours students study per week and their final exam scores. Which variable is quantitative?

Accepted Answer

Number of hours studied per week

Question 18

Which of the following best describes cross-sectional data?

Accepted Answer

Data collected on several variables at the same point in time.

Question 19

A survey asks respondents to rate their agreement with a statement on a scale from 'Strongly Disagree' to 'Strongly Agree'. This variable is best classified as:

Accepted Answer

Ordinal

Question 20

Which of the following is a key reason to be skeptical when analyzing data?

Accepted Answer

The context of the data can influence interpretation and may be slanted.

Chapter 1: Data and Decisions – Foundations of Statistical Thinking

Guida di studio - Domande di pratica

Study guide - Flashcard