Question 1

Which of the following best describes the relationship between a population and a sample, as illustrated in the first image (red and blue people)?

Accepted Answer

A sample is a subset of the population, selected to represent the whole.

Question 2

The second image shows a variety of colors. If a survey asks for a person's favorite color, what type of data is being collected?

Accepted Answer

Qualitative (categorical) data

Question 3

The third image is an eye. If a study records the eye color of each participant, what is the level of measurement for this data?

Accepted Answer

Nominal

Question 4

The fourth image is a die. If you record the outcome of each roll, what type of data are you collecting?

Accepted Answer

Quantitative, discrete data

Question 5

The fifth image shows a group of people. If you count the number of people in a room, what type of data is this?

Accepted Answer

Quantitative, discrete data

Question 6

The sixth image is a clock. If you record the time it takes for a runner to finish a race, what type of data are you collecting?

Accepted Answer

Quantitative, continuous data

Question 7

The seventh image is a thermometer. If you record the temperature in degrees Celsius, what is the level of measurement?

Accepted Answer

Interval

Question 8

The eighth image is a bar graph. If the y-axis represents the number of customers and the x-axis represents the number of stars in a restaurant review, what is the level of measurement for the x-axis?

Accepted Answer

Ordinal

Question 9

If you randomly select every 5th person from a list to participate in a survey, which sampling method are you using?

Accepted Answer

Systematic sampling

Question 10

Suppose you divide a population into groups based on gender, then randomly select equal numbers from each group. What sampling method is this?

Accepted Answer

Stratified sampling

Question 11

If you randomly select one classroom in a school and survey every student in that classroom, which sampling method are you using?

Accepted Answer

Cluster sampling

Question 12

A researcher records the birth years of participants. What is the level of measurement for this data?

Accepted Answer

Interval

Question 13

A hospital records the birth weights of newborns. What is the level of measurement for this data?

Accepted Answer

Ratio

Question 14

A survey asks participants to rate their satisfaction on a scale from 1 to 5. What is the level of measurement?

Accepted Answer

Ordinal

Question 15

A company wants to know if a new training program increases employee productivity. They randomly assign half the employees to the new program and half to the old program, then compare results. What type of study is this?

Accepted Answer

Experiment

Question 16

A researcher surveys 100 randomly selected people from a city to estimate the average income. The average income calculated from this group is called:

Accepted Answer

A statistic

Question 17

Which of the following is NOT an example of quantitative data?

Accepted Answer

Favorite color

Question 18

A quality control manager inspects every 10th item produced on a factory line. What type of sampling is this?

Accepted Answer

Systematic sampling

Question 19

A researcher divides a population into clusters based on neighborhoods, then randomly selects two neighborhoods and surveys every resident in those neighborhoods. What sampling method is this?

Accepted Answer

Cluster sampling

Question 20

Which of the following best describes a parameter?

Accepted Answer

A numerical summary describing a population

Elementary Statistics: Introduction and Foundations

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드