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Inferential vs. Descriptive Statistics

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Dr. April Clay

on 8 April 2015

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Transcript of Inferential vs. Descriptive Statistics

Inferential vs. Descriptive Statistics
Parameters & Statistics
A
parameter
is a numerical description of a
population
characteristic.

A
statistic
is a numerical description of a
sample
characteristic.
Populations & Samples
Example:
In a recent survey, 250 college students at Union College were asked if they smoked cigarettes regularly. 35 of the students said yes. Identify the population and the sample.

Statistics are a part of our everyday life
Agenda
Intro
Vocabulary
Descriptive Statistics
Inferential Statistics
Demonstration
Questions
Key Terms
Data
Statistics
Population
Sample
Mean
Mode
Median
Range
Dr. April Clay

a.) The average weekly income for all students is $405.
b.) A recent survey of a sample of 450 college students reported that the average weekly income for students is $325.
Tech Speak
In a recent study, volunteers who had less than 6 hours of sleep were
four times more likely

to answer incorrectly
on a science test than were participants who had at least 8 hours of sleep. Decide which part is the descriptive statistic and what conclusion might be drawn using inferential statistics.
Descriptive and Inferential Statistics
Infer: Sleeping less than 6 hours are more likely to answer...
Descriptive Statistics
Branches of Statistics
The study of statistics has two major branches:
descriptive statistics
and
inferential statistics
.

Involves the organization, summarization, and display of data.

Involves using a sample to draw conclusions about a population.

Larson & Farber (2003)

Relevant when a researcher
:
Summarize or describe the distribution of a single variable (Univariate descriptive statistics).

Relationship between two or more variables (bivariate/multivariate descriptive statistics).
Relevant when a researcher
:
Generalize findings from a sample to a population.

Objective is to infer the population’s characteristics from the sample’s characteristics?

Yes, we can make predictions based on a qualified sample.

Bank: Two incentive plans to increase credit cards use. Incentive to a random sample
Inferential Statistics
Descriptive Statistics
Any Questions?
Full transcript