Research

# 4 Types of Random Error

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Random error are variations in measurements that occur when you are ostensibly measuring the same thing. This can be estimated using the variations between repeated measurements and reduced by averaging these measurements. The following are common types of random error.

## Observer

Variations in the observer such as a researcher or instrument. For example, an extremely precise scale that outputs slightly different readings for the weight of an object weighed four times in succession.

## Uncontrolled Variables

Variables beyond the control of an experiment that introduce variation into measurements. For example, uncontrolled barometric air pressure that changes throughout the day causing minor disturbances to sensitive measurements.

## Controlled Variables

Minor variations in variables that are controlled. For example, a lab that is kept at 25°C that actually varies between 24.9°C and 25.1°C due to the activity of air conditioning units.

## Random Variation

Outcomes that are influenced by variations that are fundamentally probabilistic. For example, computers are known to make errors due to interference from cosmic radiation. As such, a calculation that requires a large number of data processing steps to be precise and accurate may be run multiple times to confirm the calculation.
 Overview: Random Error Type Definition Errors in measurement caused by factors that vary from one measurement to another. Related Concepts

## Experiments

This is the complete list of articles we have written about experiments.
Alternative Hypothesis
Causality
Cohort
Control Group
Controls
Dependent Variable
Empirical Evidence
Empiricism
Experiment Design
Experimental Error
Experiments
Explanatory Power
Falsifiability
Hypothesis
Measurement
Natural Experiment
Negative Control
Negative Correlation
Null Hypothesis
Original Research
Positive Control
Positive Correlation
Precision
Primary Research
Qualitative Info
Random Assignment
Random Error
Scientific Control
Scientific Fact
Soft Science
Statistics
Systematic Error

## Experiments

A guide to designing and conducting experiments.

## Negative Control

The definition of negative control with examples.

## Systematic Error

The definition of systematic error with examples.

## Random Assignment

The common types of random assignment for experiments.

## Natural Experiment

The definition of natural experiment with examples.

## Research

The common types of research.

## Precision

An overview of precision with detailed examples.

## Empirical Evidence

The definition of empirical evidence with examples.

## Statistical Analysis

A list of basic statistical analysis techniques.

## Quartile

An overview of how to calculate quartiles with a full example.

## Misuse of Statistics

Patterns of mistakes in statistics.

## Cohort

A definition of cohort with examples.

## Positive Correlation

The definition of positive correlation with examples and comparisons.

## Negative Correlation

The definition of negative correlation with examples.

## Alternative Hypothesis

The definition of alternative hypothesis with examples.

## Secondary Research

The definition of secondary research with examples.
The most popular articles on Simplicable in the past day.

## New Articles

Recent posts or updates on Simplicable.
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