Question 1

Which of the following best describes a parameter?

Accepted Answer

A numerical measurement describing some characteristic of a population.

Question 2

A researcher collects the heights (in centimeters) of all students in a university. Which type of data is this?

Accepted Answer

Quantitative, continuous data

Question 3

Which of the following is an example of data at the nominal level of measurement?

Accepted Answer

Types of cuisine: Italian, Chinese, Mexican

Question 4

A survey asks respondents to rate their satisfaction as 'unsatisfied', 'neutral', or 'satisfied'. What is the level of measurement?

Accepted Answer

Ordinal

Question 5

Which of the following statements about big data is correct?

Accepted Answer

Big data sets are so large and complex that traditional software tools cannot analyze them.

Question 6

If a data value is missing completely at random, what does this imply?

Accepted Answer

The likelihood of its being missing is independent of its value or any other values in the data set.

Question 7

Which of the following is an example of discrete data?

Accepted Answer

The number of cars passing through a toll booth in an hour

Question 8

A researcher records the years in which major historical events occurred (e.g., 1776, 1945, 2001). What is the level of measurement?

Accepted Answer

Interval

Question 9

Which of the following best describes the difference between a statistic and a parameter?

Accepted Answer

A statistic describes a sample, while a parameter describes a population.

Question 10

A scientist measures the time (in seconds) it takes for a chemical reaction to complete. Which level of measurement is this?

Accepted Answer

Ratio

Question 11

Which of the following is a correct method for handling missing data?

Accepted Answer

Impute missing values by substituting them with estimated values.

Question 12

A hospital records the blood types (A, B, AB, O) of its patients. What type of data is this?

Accepted Answer

Categorical (qualitative) data

Question 13

Which of the following is NOT a characteristic of data at the ratio level of measurement?

Accepted Answer

There is no natural zero starting point.

Question 14

A company assigns employee ID numbers to its workers. What is the level of measurement for these ID numbers?

Accepted Answer

Nominal

Question 15

Which of the following scenarios best illustrates data missing not at random?

Accepted Answer

Patients with higher medical bills are less likely to report their bill amounts.

Question 16

Which of the following is an example of ordinal data?

Accepted Answer

Movie ratings: 1 star, 2 stars, 3 stars, 4 stars, 5 stars

Question 17

A researcher wants to study the average commute time for all employees in a city. She collects data from a randomly selected group of 200 employees. What is the population in this study?

Accepted Answer

All employees in the city

Question 18

Which of the following best describes data science?

Accepted Answer

It involves applications of statistics, computer science, and software engineering, along with other relevant fields.

Question 19

A teacher records the final grades (A, B, C, D, F) of students in a class. What is the level of measurement?

Accepted Answer

Ordinal

Question 20

Which of the following is a real-world example of continuous data?

Accepted Answer

The amount of rainfall (in millimeters) measured each day in a city

Chapter 1: Introduction to Statistics – Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard