Question 1

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

Accepted Answer

Income measured in dollars

Question 2

A researcher collects data on the heights of students in a class and calculates the average. What type of statistic is the average height?

Accepted Answer

Descriptive statistic

Question 3

Which of the following best describes interval level data?

Accepted Answer

Data with meaningful differences but no true zero point

Question 4

A company wants to predict future sales based on past sales data. Which branch of statistics should they use?

Accepted Answer

Predictive statistics

Question 5

Which of the following is NOT a source of primary data?

Accepted Answer

Data collected from government reports

Question 6

A survey asks respondents to rate their satisfaction on a scale from 1 (very dissatisfied) to 5 (very satisfied). What level of measurement is this?

Accepted Answer

Ordinal

Question 7

Which statement about cross-sectional data is correct?

Accepted Answer

It is collected from a number of subjects during a single time period.

Question 8

A database is best described as:

Accepted Answer

A collection of data points organized in rows and columns

Question 9

Which of the following is a parameter?

Accepted Answer

The average income of all employees in a company

Question 10

A focus group is used to collect data about consumer attitudes. What is a key characteristic of this method?

Accepted Answer

A moderator directs a discussion and participants are aware

Question 11

Which of the following is an example of qualitative data?

Accepted Answer

The type of cheese preferred by consumers (cheddar, mozzarella, etc.)

Question 12

Which formula would you use to calculate the mean of a data set with $$n$$ values $$x_1$$, $$x_2$$, ..., x_n$$?

Accepted Answer

$$\frac{\sum_{i=1}^{n} x_i}{n}$$

Question 13

A researcher wants to know if a new teaching method improves test scores. She randomly assigns students to two groups and compares their scores. What type of data collection method is this?

Accepted Answer

Experiment

Question 14

Which of the following is true about time series data?

Accepted Answer

It consists of values measured over a range of time.

Question 15

If a variable can be ranked but the differences between ranks are not meaningful, what level of measurement is it?

Accepted Answer

Ordinal

Question 16

Which of the following is a limitation of descriptive statistics?

Accepted Answer

They do not provide information about the level of difficulty of individual data points.

Question 17

A business analyst uses a sample of sales data to estimate the average sales for all stores in a region. What type of statistics is being used?

Accepted Answer

Inferential statistics

Question 18

Which of the following is an example of secondary data?

Accepted Answer

Data obtained from published government reports

Question 19

Which of the following statements about ratio data is correct?

Accepted Answer

Ratio data allows for meaningful ratios and differences.

Question 20

A marketing team wants to know which snack people prefer: cheese puffs or cheese nips. What type of data are they collecting?

Accepted Answer

Nominal data

Introduction to Statistics: Concepts, Data Types, and Measurement Levels

Guida di studio - Domande di pratica

Study guide - Flashcard