This preview shows pages 1–4. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentThis preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Unformatted text preview: Review Probability basics Probably and the normal distribution 1.What is sampling error? How do you prevent it? 2.What are the two branches of statistics? 3.What is a percentile? 4.What are the different measures of variability? 5.What does the standard deviation represent conceptually? Condition 1: No Instruction Condition 2: Instruction = 120 s = 10 s 30 s Given these population parameters, how likely is it to get a detection time of 30s? For any situation with multiple outcomes, the probability for any outcome can be expressed as a proportion or fraction of the total number of outcomes. e.g., What is the probability of a Z in the English alphabet. Probability of Z = N of outcomes that are Z N of possible outcomes Probability of Z = 1 26 Fair Coin n outcomes = 2 (heads, tails) Fair Dice n outcomes = 6 (16) Fair Deck of Cards n outcomes = 52 Probability of 6 = 1 6 Probability of Ace = 4 52 What is the probability of getting heads when tossing a fair coin? p ( heads ) = 1 2 = 0.5 = 50% Fraction Proportion Percentage Convention: probability=proportion, but all 3 OK Accurate estimates of probability based on our de f nition require random sampling Random sampling is a process that involves selecting from a pool of outcomes Random sampling has two fundamental requirements 1.Each individual in the population must have an equal probability of 1....
View
Full
Document
This note was uploaded on 01/13/2012 for the course PSYCH 5 taught by Professor Collins during the Fall '08 term at UCSB.
 Fall '08
 COLLINS

Click to edit the document details