Class notes
PSYC1010 - UNIT 3 Notes
- Course
- Institution
in-depth and completed statistics notes for unit 3
[Show more]
Seller
Follow
barb123
Content preview
PSYC1010 Unit 3: Probability – Part 1Probability
“...is the likelihood that any one event will occur, given all the possible outcomes”.
“p” = probability (ratio or decimal)
Assigning a probability value to an inference
Example
o Flipping a coin, rolling a dice
Probability as a Mathematical System
The sample space is a set of points (data)
Persons, businesses, cities, schools
What are events?
o Observable occurrences
A heads on a coin flip
S
o Sample space
o In red
Event
o A single element in the sample space
o 5 stars, 3 triangles, 3 circles
11 total events
o If you don’t know events, you cannot calculate probability
Probability Statement
A statement of the relative frequency of an event associated with the sample space
Example
o English alphabet
What is the sample space?
26 letters, A to Z inclusive
What is the probability of event “A” occurring?
P(A) = probability of event A
Definition
o The probability of event A, P(A), is the ratio of the number of sample points that
are examples of A to the total FINITE number of sample points in the sample
space, assuming all sample points are equally likely
Probability Example
What is the probability of rolling a 3 (facing up) on a single dice?
o What is the sample space?
6 possible sample points, equally likely, 1 to 6 inclusive
o What is the probability of event A?
Event A = rolling a 3 up
o P(A) = probability of event A
P(3) = probability of rolling a 3
o P(A) = # of examples of A / Total number of sample points
P(3) = 1/6
= 0.167
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 barb123. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $12.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
73243 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now