Question 1

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

Accepted Answer

Descriptive statistics summarizes and displays data, while inferential statistics draws conclusions about a population based on a sample and probability theories.

Question 2

A researcher wants to estimate the average income of all Douglas College students. She randomly selects 50 students and calculates their average income. Which term best describes the group of all Douglas College students?

Accepted Answer

Population

Question 3

Which of the following is an example of a stratified sampling method?

Accepted Answer

Dividing a population of students into freshmen, sophomores, juniors, and seniors, then randomly sampling from each group.

Question 4

Which formula is used to determine the sampling interval $$k in $$systematic sampling?

Accepted Answer

$$k = \frac{N}{n}$$

Question 5

A company wants to study the effect of price changes on the demand for its product by adjusting the price each week and recording sales. What is the best data collection method for this scenario?

Accepted Answer

Experiment

Question 6

Which of the following is an example of data at the nominal level of measurement?

Accepted Answer

Types of cars driven by students

Question 7

A sample is considered biased if:

Accepted Answer

It does not accurately represent the intended population.

Question 8

Which of the following best describes a convenience sample?

Accepted Answer

A sample selected because it is easy to access the subjects.

Question 9

Which of the following is a quantitative, ratio-level variable?

Accepted Answer

Number of boxes of cereal on a shelf

Question 10

A researcher uses a focus group to gather opinions about a new product. This is an example of:

Accepted Answer

Primary data collection

Question 11

Which of the following is a potential disadvantage of systematic sampling?

Accepted Answer

It may be affected by periodicity in the population.

Question 12

Which of the following is an example of inferential statistics?

Accepted Answer

Predicting the outcome of an election based on a poll.

Question 13

Which of the following best describes cluster sampling?

Accepted Answer

Dividing the population into mini-populations (clusters), randomly selecting clusters, and using all members from those clusters.

Question 14

Which of the following is an example of ordinal data?

Accepted Answer

The ranking of employees as excellent, good, or poor

Question 15

A company wants to estimate the average wait time at its drive-through windows during lunch hour. Which is the most appropriate data collection method?

Accepted Answer

Direct observation

Question 16

Which of the following is a key ethical issue in statistics?

Accepted Answer

Choosing a sample that is not representative of the population

Question 17

Which of the following best describes the bootstrap method in statistics?

Accepted Answer

A resampling technique that draws many samples with replacement to estimate a population parameter.

Question 18

Which of the following is an example of secondary data?

Accepted Answer

A researcher uses unemployment data published by the U.S. Department of Labor.

Question 19

Which of the following is a discrete quantitative variable?

Accepted Answer

The number of students in a class

Question 20

A researcher wants to know if there is a relationship between employee age and productivity. Which statistical tool would be most appropriate?

Accepted Answer

Scatter plot

Chapter 1

Guida di studio - Domande di pratica

Study guide - Flashcard