Question 1

Which of the following best defines a parameter in statistics?

Accepted Answer

A numerical value that describes a characteristic of a population.

Question 2

A researcher wants to study the average cholesterol level of adults in a city. She selects 200 adults at random and calculates their average cholesterol level. In this context, what is the sample?

Accepted Answer

The 200 adults selected for the study.

Question 3

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

Accepted Answer

The color of cars in a parking lot.

Question 4

A hospital records the time (in minutes) it takes for patients to be seen by a doctor after arrival. What type of variable is 'time' in this context?

Accepted Answer

Continuous variable

Question 5

Which sampling method divides the population into groups based on a characteristic, then randomly selects some groups and includes all members from those groups in the sample?

Accepted Answer

Cluster sampling

Question 6

A teacher wants to select a sample of students from her school. She lists all students alphabetically and selects every 10th student. Which sampling method is she using?

Accepted Answer

Systematic sampling

Question 7

Which of the following best describes bias in sampling?

Accepted Answer

A sample that is selected in such a way that some members of the population are less likely to be included than others.

Question 8

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

Accepted Answer

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

Question 9

A researcher divides a population into males and females, then randomly selects 50 males and 50 females for a study. What type of sampling is this?

Accepted Answer

Stratified sampling

Question 10

Which of the following statements is true about the difference between a population and a sample?

Accepted Answer

A sample is a subset of a population.

Question 11

Which of the following is an example of convenience sampling?

Accepted Answer

Surveying people who are easiest to reach, such as friends or classmates.

Question 12

Which of the following best describes the difference between descriptive and inferential statistics?

Accepted Answer

Descriptive statistics summarize data, while inferential statistics make predictions or generalizations about a population.

Question 13

A study measures the blood pressure of 1,000 randomly selected adults to estimate the average blood pressure of all adults in a country. Which of the following is the statistic?

Accepted Answer

The average blood pressure of the 1,000 adults measured.

Question 14

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

Accepted Answer

The brand of smartphone a person uses.

Question 15

A researcher wants to ensure that her sample represents all age groups in a city. She divides the population into age groups and randomly selects individuals from each group. Which sampling method is she using?

Accepted Answer

Stratified sampling

Question 16

Which of the following is a potential consequence of bias in sampling?

Accepted Answer

The results of the study may not accurately reflect the population.

Question 17

Suppose you want to estimate the average commute time for employees at a large company. You randomly select 50 employees from a list of all employees. What type of sampling is this?

Accepted Answer

Simple random sampling

Question 18

Which of the following best describes a continuous variable?

Accepted Answer

A variable that can take on any value within a given range.

Question 19

A researcher uses a table of random numbers to select a sample from a population. Which sampling method is being used?

Accepted Answer

Simple random sampling

Question 20

Which of the following is NOT a type of probability sampling?

Accepted Answer

Convenience sampling

Chapter 1

Guida di studio - Domande di pratica

Study guide - Flashcard