Statistics Chapter on Data Collection

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Questions and Answers

What is the definition of a variable in the context of data collection?

A set of measurements obtained for a particular element.

A method used to collect data.

A characteristic of interest for the elements. (correct)

An entity on which data are collected.

Which of the following statements best describes primary data?

Data that has been collected by another party.

Data that you have collected for your own use. (correct)

Data that depends on secondary sources for accuracy.

Data that is readily available and inexpensive.

What is the primary disadvantage of collecting primary data?

It is less detailed than secondary data.

It can be more expensive and time-consuming. (correct)

It often lacks reliability.

It cannot be used for extensive research.

Which type of data is classified by descriptive terms?

Qualitative Data Signup and view all the answers

In a dataset, if there are 10 elements, what is the expected number of observations?

10 observations Signup and view all the answers

What type of statistic is demonstrated by the conclusion that households with children are more likely to have Internet access?

Inferential statistic Signup and view all the answers

What type of data is represented by the household income survey table from 2012?

Cross-sectional data Signup and view all the answers

What does a cumulative relative frequency distribution show?

The proportion of observations falling below each class limit Signup and view all the answers

What is the purpose of a histogram in data representation?

To display the number or percentage of observations in each class Signup and view all the answers

How is the relative frequency calculated in a relative frequency distribution?

By dividing each frequency by the total number of observations Signup and view all the answers

What is the key distinction between a parameter and a statistic?

A parameter describes a population, while a statistic describes a sample. Signup and view all the answers

Why is sampling often necessary when studying a population?

Gathering data on the entire population is usually too expensive or time-consuming. Signup and view all the answers

If a statistician reports the average age of graduate students as 28 years based on a survey of 100 students, what does this statistic indicate?

It is a statistic that estimates the parameter of the entire graduate student population. Signup and view all the answers

What type of data is represented by the marital status of survey respondents (Single, Married, Divorced)?

Qualitative data Signup and view all the answers

When the Department of Transportation states there are 17 accidents per day on average, what type of statistic does this represent?

Descriptive statistic Signup and view all the answers

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Description

This quiz tests your understanding of key concepts in statistics, particularly focusing on data collection and analysis. It covers definitions, types of data, sampling methods, and statistical representations. Perfect for students looking to reinforce their knowledge in statistics.