Question 1

Which of the following best describes a parameter in statistics?

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. The mean height calculated from this data is:

Accepted Answer

A parameter, because it describes a population.

Question 3

Which of the following is an example of categorical data?

Accepted Answer

The blood types (A, B, AB, O) of patients in a clinic.

Question 4

Which of the following is an example of discrete quantitative data?

Accepted Answer

The number of books on a library shelf.

Question 5

A survey asks respondents to rate their satisfaction on a scale from 1 (very dissatisfied) to 5 (very satisfied). What is the level of measurement for this data?

Accepted Answer

Ordinal

Question 6

Which of the following variables is measured at the interval level?

Accepted Answer

The temperature in Celsius recorded each day.

Question 7

Which of the following statements about ratio level data is TRUE?

Accepted Answer

Ratio level data has a true zero point.

Question 8

A researcher records the years in which major historical events occurred (e.g., 1492, 1776, 2000). What is the level of measurement for these data?

Accepted Answer

Interval

Question 9

Which of the following best describes 'big data'?

Accepted Answer

Data sets so large and complex that traditional software tools cannot analyze them.

Question 10

A data value is missing completely at random if:

Accepted Answer

The likelihood of its being missing is independent of its value or any other values.

Question 11

Which of the following is a common method for correcting missing data?

Accepted Answer

Imputing missing values by substituting them with estimated values.

Question 12

A researcher collects the shirt numbers of soccer players to identify them. What type of data is this?

Accepted Answer

Categorical (nominal)

Question 13

Which of the following is an example of continuous data?

Accepted Answer

The length of a river measured in kilometers.

Question 14

Which of the following best distinguishes interval level data from ratio level data?

Accepted Answer

Ratios are meaningful in ratio data but not in interval data.

Question 15

A hospital records the time (in minutes) it takes for patients to be seen by a doctor. Which level of measurement is this?

Accepted Answer

Ratio

Question 16

A survey asks participants to select their favorite fruit: apple, banana, orange, or grape. What is the level of measurement?

Accepted Answer

Nominal

Question 17

Which of the following scenarios describes data that is missing not at random?

Accepted Answer

Survey respondents skip a question about income because they have a high income.

Question 18

Which of the following is NOT a characteristic of ordinal level data?

Accepted Answer

Differences between values are meaningful.

Question 19

A university wants to analyze the average GPA of all its students. The calculated average GPA from all students is:

Accepted Answer

A parameter, because it is based on the entire population.

Question 20

Which of the following best describes data science?

Accepted Answer

The application of statistics, computer science, and software engineering to analyze complex data.

Introduction to Statistics: Data Types, Levels of Measurement, and Data Quality

Guida di studio - Domande di pratica

Study guide - Flashcard