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Week 6 Notes - Psychology 211

by: Kennedy Patterson

Week 6 Notes - Psychology 211 Psychology 211

Kennedy Patterson
GPA 3.9
Psychology 211-003 Elem Statistical Methods
Andre Souza

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Week 6 Notes - Psychology 211 2/9/15-2/11/15 Chapter 7
Psychology 211-003 Elem Statistical Methods
Andre Souza
Class Notes
25 ?




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This 3 page Class Notes was uploaded by Kennedy Patterson on Monday February 16, 2015. The Class Notes belongs to Psychology 211 at University of Alabama - Tuscaloosa taught by Andre Souza in Spring2015. Since its upload, it has received 141 views. For similar materials see Psychology 211-003 Elem Statistical Methods in Psychlogy at University of Alabama - Tuscaloosa.

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Date Created: 02/16/15
Psychology 211 Week 6 Chapter 7 291521115 Probability A random experiment as opposed to a one know the outcome is one in which the outcome is determined by chance o Random outcome by chance o Deterministic outcome known 0 For a random experiment E the set of all possible outcomes of E is called 0 For instance for a cointoss experiment S the possible outcomes are head or tail Then S H T 0 For a random experiment eg cointoss the possible outcomes are known but it is uncertain which one will occur 0 For a particular possible outcome for a random phenomenon the probability of that outcome is the proportion of times that outcome would occur in a very long sequence of observations 0 If you toss a coin 1oooooooooooo000000000 times about half of this will be tails and about the other half will be heads Proportion w 1 50 Total 2 o You went to a restaurant this weekend there were 1500 girls you decided to ask each girl if they wanted to kiss you What are the possible outcomes eg sample space No Response Frequency Proportion f ou k39dd39 g No 973 064866 Ok now Are you kidding me 523 034866 I y Okay now leave 4 00026 eave Total 1500 1 If you randomly choose one of these girls how likely are you to pick one that wanted to kiss you Basic Probability Rules o Let PA denote the probability of a possible outcome denoted by the letter A Pnot A 1PA if you know the probability of an event then the probability that this event does not occur is 1PA If you go out tonight the probability that you 36 O17 will find the girl of your dreams is PDG P t 6 1 P 6 0003 The probability of not finding the girl IDEth 6 1 01 of your dreams if you go out tonight iS 139 Pnot 6 38 PDGO997 Psychology 211 Week 6 Chapter 7 291521115 0 Let PA denote the probability of a possible outcome denoted by the letter A 0 Let PB denote the probability of a possible outcome denoted by the letter B 0 Let A and B be mutually exclusive outcomes if you go out tonight the probability of finding a brunette woman is PBrunette 023 and the probability of finding a blonde is PBonde 013 What is the probability of finding a blonde or brunette PA or B Sum ofA and B PA or B 023 013 036 0 Let PA denote the probability of a possible outcome denoted by the letter A 0 Let PB denote the probability of a possible outcome denoted by the letter B 0 Let A and B be indeiendent outcomes if you roll 2 dice what is the probability that you will get a 1 and a 2 o P1 017 and P2 017 o P1 and 2 017 x 017 003 There are 3 doors behind 2 doors are goats and behind one door is a car You choose door 2 amp open the 1st one The 1st one has a goat What is the probability that there is the car behind the 2nd door Greater probability of the car being behind door 3 you have a 13 chance behind door 2 and 23 chance behind door 3 13 23 23 The more doors there are the more you should switch Psychology 211 Week 6 Chapter 7 291521115 Students 70 Exam 1 grades 82 0 Exam 1 standard deviation 2 You got a 76 How many people made a 75 or above 0 Z Z 76 7682 3 2 3 on ztable 0013 10013 9987 9987 9987 made above a 75 74 76 78 80 82 84 86 88 90 J260 o10 What is the top 5 9 What is X 105 95 95 on ztable 165 X 260 165 10 16510 260 x 230 240 250 260 270 280 290 x


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