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Inside Collection (Textbook):

Textbook by: Barbara Illowsky, Ph.D., Susan Dean. E-mail the authors

# Summary

Summary: This module provides an outline/review of key concepts related to statistical sampling and data.

## Statistics

• Deals with the collection, analysis, interpretation, and presentation of data

## Probability

• Mathematical tool used to study randomness

• Population
• Parameter
• Sample
• Statistic
• Variable
• Data

## Types of Data

• Quantitative Data (a number)
• Discrete (You count it.)
• Continuous (You measure it.)
• Qualitative Data (a category, words)

## Sampling

• With Replacement: A member of the population may be chosen more than once
• Without Replacement: A member of the population may be chosen only once

## Random Sampling

• Each member of the population has an equal chance of being selected

## Sampling Methods

• Random
• Simple random sample
• Stratified sample
• Cluster sample
• Systematic sample
• Not Random
• Convenience sample

## Frequency (freq. or f)

• The number of times an answer occurs

## Relative Frequency (rel. freq. or RF)

• The proportion of times an answer occurs
• Can be interpreted as a fraction, decimal, or percent

## Cumulative Relative Frequencies (cum. rel. freq. or cum RF)

• An accumulation of the previous relative frequencies

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##### What are tags?

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| External bookmarks

#### Module to:

My Favorites (?)

'My Favorites' is a special kind of lens which you can use to bookmark modules and collections. 'My Favorites' can only be seen by you, and collections saved in 'My Favorites' can remember the last module you were on. You need an account to use 'My Favorites'.

| A lens I own (?)

#### Definition of a lens

##### Lenses

A lens is a custom view of the content in the repository. You can think of it as a fancy kind of list that will let you see content through the eyes of organizations and people you trust.

##### What is in a lens?

Lens makers point to materials (modules and collections), creating a guide that includes their own comments and descriptive tags about the content.

##### Who can create a lens?

Any individual member, a community, or a respected organization.

##### What are tags?

Tags are descriptors added by lens makers to help label content, attaching a vocabulary that is meaningful in the context of the lens.

| External bookmarks