Class notes

Standard Deviation (Week 2 Notes)

5 views 0 purchase

Course
Psyc 101

Institution
University Of British Columbia (UBC )

The Standard Deviation Notes provide a comprehensive understanding of one of the key statistical measures in data analysis. Gain insights into the concept and calculation of standard deviation, which measures the dispersion or variability of a dataset. Explore how standard deviation is used to asse...

[Show more]

Preview 1 out of 2 pages

View example

Uploaded on May 11, 2023
Number of pages 2
Written in 2020/2021
Type Class notes
Professor(s) Eva zysk
Contains Standard deviation

CA$10.45

Added

Add to cart Add to wishlist

100% satisfaction guarantee
Immediately available after payment
Both online and in PDF
No strings attached

Standard Deviation Notes

- Standard deviation
calculated with the mean
can tell you how spread
out data is.
- Can be calculated with
spreadsheet, calculator,
or math equation.
1. Calculate mean
2. Subtract the mean
from each data point
3. Square each
difference
4. Calculate the mean of
the squared
differences
5. Take the square root.
- Lower case sigma stands for standard deviation of a population. Upper case sigma
tells us to calculate the sum for each instance. X is each data point. X bar is the
mean of the data points. And n is the number of data points.

The Normal distribution
- Data from a population or sample
- Parameter: a number that describes data from a population
- Statistic: a number that describes data from a sample
- Mean + Standard Deviation.

Sample Population
Mean -Over X Greek letter 
Standard s Greek letter 
Deviation
Type Statistic Parameter
Graph Characterizes the spread of the Characterizes the position
normal distribution. Larger the of the normal distribution.
standard deviation (), flatter the Curve always follows the
curve will be, smaller the standard mean ()
deviation (), taller the curve will
be.

- A special type of bell curve shaped  bell/normal curve
- Tendency for data to cluster around central value (mean)
- Weight, height, volume etc.
- Exam scores follow normal distribution.
- The normal distribution is unimodal (single peak)
- The normal curve is symmetric about its mean (middle is tallest)
- The parameters  and completely  characterize the normal distribution
- X ~ N (, ) (variable x has a normal distribution with a mean miu and standard
deviation of sigma)

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.

Quick and easy check-out

You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.

Focus on what matters

Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!

Frequently asked questions

What do I get when I buy this document?

You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.

Satisfaction guarantee: how does it work?

Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.

Who am I buying these notes from?

Stuvia is a marketplace, so you are not buying this document from us, but from seller yaldahomayoun. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for CA$10.45. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

79789 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy study notes for 14 years now

Start selling