Question 1

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

Accepted Answer

A parameter is a numerical summary from a population, while a statistic is a numerical summary from a sample.

Question 2

A researcher wants to estimate the average commute time for all students at a university. She surveys 100 randomly selected students and calculates their average commute time. In this context, what is the population?

Accepted Answer

All students at the university

Question 3

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

Accepted Answer

Blood type (A, B, AB, O)

Question 4

Suppose you flip a coin 1000 times and record the proportion of heads after each flip. What statistical concept does the stabilization of this proportion illustrate?

Accepted Answer

Long-run regularity

Question 5

Which of the following best defines 'bias' in the context of statistics?

Accepted Answer

A systematic deviation caused by design, comparison, or selection issues

Question 6

A hospital wants to know if a new scheduling system reduces ER wait times compared to the current system. What is the explanatory variable in this study?

Accepted Answer

The scheduling system used

Question 7

Which of the following is an example of a discrete quantitative variable?

Accepted Answer

Number of ER visits in a month

Question 8

What is the main purpose of descriptive statistics?

Accepted Answer

To summarize and visualize observed data

Question 9

Which of the following statements about sampling is correct?

Accepted Answer

Sampling allows us to estimate population parameters and quantify uncertainty.

Question 10

A researcher collects data on students' test scores and their hours of study. She finds a positive association between the two. Which of the following is the most statistically accurate way to describe this finding?

Accepted Answer

Higher test scores are associated with more hours of study.

Question 11

Which of the following best describes an observational study?

Accepted Answer

A study that observes existing groups without assigning treatments

Question 12

Which measurement scale allows for meaningful differences and ratios?

Accepted Answer

Ratio

Question 13

A company wants to compare the average battery life of two different brands. Which type of statistical method should they use?

Accepted Answer

Inferential statistics

Question 14

Which of the following is an example of a confounding variable in a study examining the effect of exercise on weight loss?

Accepted Answer

Dietary habits

Question 15

Suppose a survey asks people to rate their satisfaction on a scale from 1 (very dissatisfied) to 5 (very satisfied). What type of variable is this?

Accepted Answer

Ordinal

Question 16

Which of the following best describes the role of statistics in research?

Accepted Answer

To provide a disciplined approach to study design and data collection

Question 17

A study finds that the average test score for a sample of 50 students is 78. What is this value called?

Accepted Answer

Statistic

Question 18

Which of the following is NOT a step in the statistical process?

Accepted Answer

Ignore context and focus only on calculations

Question 19

Why is it important to consider context when interpreting statistical results?

Accepted Answer

Context helps determine the meaning and relevance of the results.

Question 20

Which of the following best describes a 'sampling frame'?

Accepted Answer

The list or mechanism from which the sample is drawn

Introduction to Statistics: Foundations, Data Types, and the Statistical Process

Guida di studio - Domande di pratica

Study guide - Flashcard