Question 1

A researcher wants to estimate the average commute time for all employees in a large corporation. She randomly selects 50 employees and records their commute times. In this context, what is the population?

Accepted Answer

All employees in the corporation

Question 2

Which of the following best describes a parameter?

Accepted Answer

A numerical summary of a population

Question 3

A study reports that 41% of the registered voters in California voted in the last primary. This statement is an example of:

Accepted Answer

Descriptive statistics

Question 4

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

Accepted Answer

Annual income in dollars

Question 5

A researcher classifies survey responses as 'agree', 'neutral', or 'disagree'. What is the level of measurement for this variable?

Accepted Answer

Ordinal

Question 6

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

Accepted Answer

Favorite type of cuisine

Question 7

A study randomly assigns half of the patients to receive a new drug and the other half to receive a placebo. The study then compares recovery rates. What type of study is this?

Accepted Answer

Experiment

Question 8

A researcher selects every 10th person entering a shopping mall to participate in a survey. What sampling technique is being used?

Accepted Answer

Systematic sampling

Question 9

Which of the following best describes cluster sampling?

Accepted Answer

Dividing the population into groups, randomly selecting some groups, and using all members from those groups

Question 10

A researcher wants to study the effect of a new teaching method. She randomly assigns students to two groups: one uses the new method, the other uses the traditional method. After a semester, she compares test scores. Which is the explanatory variable?

Accepted Answer

Teaching method

Question 11

Which of the following is an example of inferential statistics?

Accepted Answer

Using a sample of 500 voters to estimate the proportion of all voters who support a candidate

Question 12

A researcher divides a city into neighborhoods and randomly selects several neighborhoods. All residents in those neighborhoods are surveyed. What sampling method is this?

Accepted Answer

Cluster sampling

Question 13

Which of the following is a characteristic of data at the interval level of measurement?

Accepted Answer

Differences between values are meaningful, but there is no true zero

Question 14

A researcher wants to study the relationship between exercise frequency and cholesterol levels. She collects data from 200 volunteers. What type of study is this?

Accepted Answer

Observational study

Question 15

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

Accepted Answer

Type of smartphone owned

Question 16

A researcher wants to ensure that her sample reflects the age distribution of the population. She divides the population into age groups and randomly samples from each group. What sampling method is this?

Accepted Answer

Stratified sampling

Question 17

Which of the following best describes convenience sampling?

Accepted Answer

Selecting individuals who are easiest to reach

Question 18

A researcher records the number of goals scored by each player in a soccer tournament. What is the level of measurement for this variable?

Accepted Answer

Ratio

Question 19

Which of the following is a key advantage of using a simple random sample?

Accepted Answer

Each member of the population has an equal chance of being selected

Question 20

A researcher wants to study the effect of a new fertilizer on plant growth. She applies the fertilizer to half the plants and leaves the other half untreated. After 8 weeks, she measures the height of each plant. What is the response variable?

Accepted Answer

Plant height

Chapter 1: Introduction to Statistics – Study Notes

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드