Question 1

Which of the following best defines 'Statistics' as described in the study materials?

Accepted Answer

The science of collecting, organizing, summarizing, and analyzing information to draw conclusions or answer questions.

Question 2

In a study where a survey is sent to 3,085 adults aged 18 years or older in a certain country to estimate the percentage who have a specific health condition, what is the 'population'?

Accepted Answer

All adults aged 18 years or older in the country.

Question 3

Which of the following is an example of a 'sample'?

Accepted Answer

A group of 500 randomly selected university students surveyed about their study habits.

Question 4

A 'statistic' is best described as:

Accepted Answer

A numerical measurement describing some characteristic of a sample.

Question 5

Which of the following best describes 'descriptive statistics'?

Accepted Answer

Consists of organizing and summarizing data through numerical summaries, tables, and graphs.

Question 6

In a designed experiment, what is the main advantage over an observational study?

Accepted Answer

The researcher can control and randomly assign the explanatory variable, reducing confounding.

Question 7

Which of the following is an example of a confounding variable in a medical study testing a new drug?

Accepted Answer

Patients' age, if not controlled for, when testing the effect of the drug on recovery time.

Question 8

A lurking variable is best described as:

Accepted Answer

A variable that affects the response variable but is not considered in the study.

Question 9

Which of the following is a characteristic of a cross-sectional study?

Accepted Answer

It collects information about individuals at a specific point in time or over a very short period.

Question 10

A case-controlled (retrospective) study is most likely to be used when:

Accepted Answer

Researchers need to look at existing records to study rare diseases.

Question 11

Which of the following scenarios best illustrates the concept of 'confounding'?

Accepted Answer

A study finds that people who carry lighters are more likely to develop lung cancer, but fails to account for smoking.

Question 12

Suppose a researcher wants to estimate the average income of all households in a city. She surveys 200 randomly selected households. In this context, what is the 'sample'?

Accepted Answer

The 200 randomly selected households surveyed.

Question 13

Which of the following is NOT a type of observational study described in the materials?

Accepted Answer

Randomized controlled trial.

Question 14

A researcher collects data on the number of hours students study per week and their exam scores. Which of the following would be a lurking variable in this study?

Accepted Answer

The students' prior knowledge of the subject.

Question 15

Which of the following best describes the main purpose of statistics?

Accepted Answer

To draw conclusions or answer questions by collecting, organizing, summarizing, and analyzing information.

Question 16

In a designed experiment, what is the response variable?

Accepted Answer

The variable that is measured to assess the effect of the explanatory variable.

Question 17

Which of the following is a potential disadvantage of a case-controlled (retrospective) study?

Accepted Answer

It may rely on inaccurate or incomplete records from the past.

Question 18

A researcher wants to know if a new teaching method improves student performance. She randomly assigns students to two groups: one uses the new method, the other uses the traditional method. What type of study is this?

Accepted Answer

Designed experiment.

Question 19

Which of the following is an example of descriptive statistics?

Accepted Answer

Calculating the mean age of participants in a clinical trial.

Question 20

If $$ n  is $$the number of individuals in a sample and $$ N  is $$the number of individuals in the population, which of the following is always true?

Accepted Answer

$$ n \leq N $$

Introduction to Data Collection in Statistics

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