Question 1

Which of the following best describes the difference between a population and a sample in statistics?

Accepted Answer

A population is the entire group under study, while a sample is a subset of the population.

Question 2

A researcher collects data on the heights of all students in a university. The average height calculated from this data is an example of:

Accepted Answer

A parameter

Question 3

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

Accepted Answer

The brand of car owned

Question 4

A variable that can take on any value within a given range is called:

Accepted Answer

A continuous variable

Question 5

Which level of measurement allows for meaningful ratios and has a true zero point?

Accepted Answer

Ratio

Question 6

A survey asks students to rate their satisfaction with campus dining as 'unsatisfied', 'neutral', or 'satisfied'. What is the level of measurement for this variable?

Accepted Answer

Ordinal

Question 7

Which sampling method involves dividing the population into subgroups and randomly selecting members from each subgroup?

Accepted Answer

Stratified sampling

Question 8

A polling firm randomly selects every 10th person from a list of registered voters. This is an example of:

Accepted Answer

Systematic sampling

Question 9

Which of the following best describes the main risk of 'p-hacking' in statistical analysis?

Accepted Answer

It increases the likelihood of finding a statistically significant result by chance.

Question 10

In an experiment, neither the subjects nor the experimenters know who is receiving the treatment or placebo. This is called:

Accepted Answer

Double-blind

Question 11

A student stands outside a coffee shop and surveys the first 20 people about their caffeine habits. What type of sampling is this?

Accepted Answer

Convenience sampling

Question 12

Which of the following is an example of response bias?

Accepted Answer

A manager asks employees, 'Have you ever taken home store merchandise without paying for it?'

Question 13

Which of the following is a key characteristic of a good statistical question?

Accepted Answer

It anticipates variability in the data.

Question 14

A study collects data on the number of car accidents in a city each month for the past five years. What type of observational study is this?

Accepted Answer

Retrospective

Question 15

Which of the following is an example of a nonsampling error?

Accepted Answer

A data entry mistake when recording survey responses

Question 16

A researcher divides a city into 100 blocks, randomly selects 10 blocks, and surveys every household in those blocks. What sampling method is used?

Accepted Answer

Cluster sampling

Question 17

Which of the following best describes inferential statistics?

Accepted Answer

Drawing conclusions about a population based on sample data

Question 18

A variable that names, labels, or categorizes without a meaningful order is at which level of measurement?

Accepted Answer

Nominal

Question 19

Which of the following scenarios is most likely to result in undercoverage bias?

Accepted Answer

Surveying only students who attend morning classes to represent all students

Question 20

Which of the following is a discrete variable?

Accepted Answer

The number of cars in a parking lot

Basic Concepts and Methods in Statistics: Week 1 Study Guide

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드