What are the two main types of statistics?

Descriptive Statistics and Inferential Statistics.

What is a parameter?

A numerical summary of a population.

What is a statistic?

A numerical summary of a sample.

12 men have walked on the moon, and their average time on the moon was 43.92 hours. Parameter or statistic?

Parameter — all 12 men who have walked on the moon are being considered.

A study of 6,076 adults in public restrooms found that 23% did not wash their hands. Parameter or statistic?

Statistic — the 6,076 adults are a sample.

What are the two main types of statistics?

Descriptive Statistics and Inferential Statistics.

What are descriptive statistics?

Methods for summarizing and displaying data, using things such as graphs, tables, means, and medians.

What is the purpose of descriptive statistics?

To reduce data to simple summaries without distorting or losing important information.

What are inferential statistics?

To reduce data to simple summaries without distorting or losing important information.

What are inferential statistics?

Methods of making decisions, predictions, or conclusions about a population based on a sample.

"Based on current trends, in 2033, 148 million Americans will be enrolled in an HMO." Descriptive or inferential?

Inferential — it makes a prediction about the future.

"The median household income for people aged 25–34 is $35,888." Descriptive or inferential?

Descriptive — it summarizes existing data.