Statistics

Identify the Population and Sample, and describe the sample data set: A survey of 1001 U.S. adults found that 47% of respondents typically feel well rested on weekdays.

Population: Collection of all U.S. adults Sample: Collection of responses of 1001 U.S. adults who were surveyed Sample data set: 47% of respondents who typically feel well rested on weekdays and 53% who do not

Identify the Population and Sample, and describe the sample data set: To gather information about starting salaries at companies listed in the Standard & Poor's 500, a researcher contacts 74 of the 500 companies.

Population: Collection of all companies listed in the Standard & Poor's 500 Sample: Collection of the responses of 74 Standard & Poor's 500 companies surveyed Sample data set: Starting salaries of the 74 companies surveyed

Identify the Population and Sample, and describe the sample data set: A survey of 2111 U.S. small business owners found that 54% oppose increasing the minimum wage.

Population: Collection of responses from small business owners in the U.S. Sample: Collection of responses of 2111 U.S. small business owners Sample data set: 54% of small business owners who oppose increasing the minimum wage and 46% who do not

Identify the Population and Sample, and describe the sample data set: A survey of 1500 U.S. adults found that 59% have never had a vaccine reaction.

Population: Collection of the U.S. adults who have received vaccines Sample: Collection of responses of 1500 U.S adults who have received vaccines Sample data set: 59% of U.S. adults who have never had a vaccine reaction and 41% who have

Pop. or Sample: A survey of 250 members from an organized union of over 20,000 members

Sample-it's a subset of the 20,000

Identify the Population and Sample, and describe the sample data set: A survey of 1021 U.S. adults found that 45% have a favorable view of Cuba.

Population: Collection of the responses of all U.S. adults Sample: Collection of the responses of the 1021 U.S. adults surveyed Sample data set: 45% of adults who have a favorable view of Cuba and 55% who do not

Pop. or Sample: The carbon monoxide levels of 12 of 49 people who escaped a burning building

Sample

determine whether the number describes a population parameter or a sample statistic: The average salary for 24 of a hospital's 82 registered nurses is $71,000

Sample statistic. The value $71,000 is a numerical description of a sample of average salaries.

determine whether the number describes a population parameter or a sample statistic: A survey of 1000 U.S. adults found that 79% think that the spread of infectious diseases is a major threat to the well-being of the United States.

Sample statistic. The value 79% is a numerical description of a sample of U.S. adults.

determine whether the number describes a population parameter or a sample statistic: In a survey of automobile owners, 6% said they had to change their engine control module at least once.

Sample statistic. The value of 6% is a numerical description of the sample of automobile owners.

Parameter vs Statistic

A parameter is a numerical description of a population characteristic. A statistic is a numerical description of a sample characteristic.

Population vs Sample

A population is the collection of all outcomes, responses, measurements, or counts that are of interest. A sample is a subset, or part, of a population. A sample is used to gain information about a population

How is a sample related to a population?

A sample is a subset of a population

Define data

Data consist of information coming from observations, counts, measurements, or responses.

descriptive statistics vs inferential statistics

Descriptive statistics is the branch of statistics that involves the organization, summarization, and display of data. Inferential statistics is the branch of statistics that involves using a sample to draw conclusions about a population.

Pop. or Sample: The nationality of every person passing through a customs station

Population

Pop. or Sample: The salary of each employee of an advertising firm:

Population

determine whether the number describes a population parameter or a sample statistic: Sixty-two of the 97 passengers aboard the Hindenburg airship survived its explosion.

Population parameter. The 62 surviving passengers out of 97 total passengers is a numerical description of all of the passengers of the Hindenburg who survived.

Pop. or Sample: The number of guests in each room of a hotel

Population-all guests

Define Statistics

Statistics is the science of collecting, organizing, analyzing, and interpreting data to make decisions.

A study of college students showed that participants earned higher scores on quizzes and midterm exams with better sleep.

The sample is scores on quizzes and midterm exams by the participants in the study. The population is the collection of all of the college students' scores on quizzes and midterm exams. The statement "participants earned higher scores on quizzes and midterm exams with better sleep" is an example of descriptive statistics. Individuals who sleep better will be more likely to perform better on quizzes and midterm exams than they would with worse sleep.

What are the two main branches of statistics?

descriptive statistics and inferential statistics