Question 1

Which of the following best describes the process involved in conducting a statistical study?

Accepted Answer

Prepare, analyze, and conclude.

Question 2

A researcher wants to study the effect of a new drug on blood pressure. She divides participants into two groups, gives the drug to one group and a placebo to the other, and compares the results. What type of study is this?

Accepted Answer

Experiment

Question 3

Which of the following is an example of quantitative data?

Accepted Answer

The weights of newborn babies in a hospital

Question 4

A survey asks respondents to rate their satisfaction as 'very satisfied', 'satisfied', 'neutral', 'dissatisfied', or 'very dissatisfied'. What is the level of measurement for this data?

Accepted Answer

Ordinal

Question 5

Which of the following best defines a parameter?

Accepted Answer

A numerical measurement describing some characteristic of a population

Question 6

In a study, the number of cars passing through a toll booth in one hour is recorded. What type of quantitative data is this?

Accepted Answer

Discrete

Question 7

Which sampling method involves dividing the population into subgroups with similar characteristics and then sampling from each subgroup?

Accepted Answer

Stratified sampling

Question 8

A researcher collects the annual revenue of six different companies for the year 2010. What type of data is this?

Accepted Answer

Cross-section data

Question 9

Which of the following is NOT a characteristic of data at the interval level of measurement?

Accepted Answer

There is a natural zero starting point

Question 10

A pollster selects every 10th person who enters a shopping mall to participate in a survey. What type of sampling is this?

Accepted Answer

Systematic sampling

Question 11

Which of the following is an example of ratio level data?

Accepted Answer

Class times of 50 minutes and 100 minutes

Question 12

A study examines the relationship between ice cream sales and drownings, finding that both increase in the summer. What is the most likely explanation for this association?

Accepted Answer

A lurking variable, such as temperature, affects both

Question 13

Which of the following best describes a simple random sample?

Accepted Answer

Every possible sample of the same size has the same chance of being chosen

Question 14

A hospital administrator wants to estimate the average length of stay for all patients. She randomly selects 5 wards and records the length of stay for every patient in those wards. What sampling method is used?

Accepted Answer

Cluster sampling

Question 15

Which of the following is a key difference between an observational study and an experiment?

Accepted Answer

Experiments apply a treatment to observe its effect, while observational studies do not modify subjects.

Question 16

A researcher collects data on the same group of patients' blood pressure every month for a year. What type of data is this?

Accepted Answer

Time-series data

Question 17

Which of the following is an example of convenience sampling?

Accepted Answer

Surveying people who are easiest to reach

Question 18

Which of the following best describes discrete data?

Accepted Answer

Data that result from a countable number of possible values

Question 19

A study collects data from medical records of patients treated for heart disease in the past 10 years. What type of observational study is this?

Accepted Answer

Retrospective (case control) study

Question 20

Which of the following statements about levels of measurement is correct?

Accepted Answer

Ratio data allow for meaningful ratios and have a true zero.

Chapter 1: Introduction to Statistics – Structured Study Notes

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드