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Statistics overview

Statistics overview

Description:

This lesson will provide a definition and overview of statistics

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Tutorial

What's Covered

This lesson will provide you with an overview of what statistics really is by exploring:

  1. Statistics
  2. Types of Statistics

1. STATISTICS

You might be wondering, what is statistics? Is it some complicated formula? Is it some goofy graph that you really don't know that much about?

Numbers might be presented in a bar graph:


Or numerically:

When people refer to statistics, they're usually referring to information called data that's been collected and synthesized within a statistical study, and sometimes presented in an intimidating graphical form, like this. While the image is small and difficult to read, you get the idea that a LOT of information can be presented in the form of a graph


Statistics is a neat way to describe a messy world. It's not pretty all the time. But statistics allows us a way to simplify things down.

Step by Step

The practice of statistics deals with four main steps:

  1. Collect. Collect the information from a variety of sources
  2. Analyze. Analyze the information that you've collected
  3. Interpret. Interpret what that analysis means
  4. Present. Present it in a way that anyone can understand


Term to Know

    • Statistical study
    • A way to collect information from individuals

2. TYPES OF STATISTICS

When you use descriptive statistics, you are going to analyze what's going on at a particular point and use statistics to describe the information that you've obtained.

On the other hand, when you use inferential statistics, you are going to use statistics that you've obtained and make a generalization about the population at large.

IN CONTEXT

Let's say that you read the newspaper this morning and discovered that the average household income in the United States was reported to be $46,700.

This information didn't come from sampling every household in the United States. That wouldn't be realistic or feasible to knock on all the doors and speak to all those people.
But someone arrived at this number. So, how did they get it?

Well, a sample was taken, and a generalization was made about the entire United States based on that sample.

This is inferential statistics.


Terms to Know

    • Descriptive statistics
    • Using only the information at hand to describe the selected group of individuals.
    • Inferential statistics
    • Using the information at hand to make a larger, more general statement about the entire population of individuals.
Summary

Statistics allows us to synthesize the information we get from the world around us. There are two types of statistics: Descriptive statistics describes information gathered at a particular point and Inferential statistics gathers information and then makes a generalization or prediction about the population.

Good luck!

Source: THIS WORK IS ADAPTED FROM SOPHIA AUTHOR JONATHAN OSTERS. bar chart, CC, https://en.wikipedia.org/wiki/Chart#/media/File:Black_cherry_tree_histogram.svg no modifications made

TERMS TO KNOW
  • Statistics

    The study of collecting, analyzing, interpreting, and presenting information

  • Statistical study

    A way to collect information from individuals

  • Statistical analysis

    All the ways of collecting, analyzing, and interpreting the data

  • Descriptive statistics

    Using only the information at hand to describe the selected group of individuals

  • Inferential statistics

    Using the information at hand to make a larger, more general statement about the entire population of individuals