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# Kean University - HIST 3854 - Class Notes - Week 8

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Kean University - HIST 3854 - Class Notes - Week 8

##### Description: These note cover the following Various types of fictional beasts, monstrous births, and tales of ancient monsters
This preview shows pages 1 - 2 of a 3 page document. to view the rest of the content 10/24/2018 Psych Stat 3200
Week 8
1. Topic: Mean and Standard Deviation with Probabilities a. Expected value and Risk i. Definitions 1. Expected value is mean
2. Risk is Standard Deviation
ii. KEY TERMS 1. Random variable I. Quantitative result of an experiment that can
control by chance
II. More detail (sentence) 2. Discrete Random Variable: Finite number of  countable classes 3. Continuous Random Variable: Countless Number of  Values 4. Discrete probability distribution I. Total # of observations of a given outcome /
total # of outcomes
b. Special Terminology i. Expected Value 1. Calculation: Sum (Each Score X it’s probability) 2. I. ( 0 x.24) + (1 x . 20) + (2 x . 32) + (3 X .24) =
2.57
1 c. Calculation of Discrete Probability solution i. Square Root of {sum (score – expected value) 2  X  Probability I. {(0-2.57)2 * .24}  + {(1-2.57)2 * .20} + {(2-
2.57)2 * .32} + {(3 – 2.57)2 * .24} = 2.25
II.     2.25 = 1.5 Here is another example of these formulas Group 1: IQ score among students in a class IQ Score # of Students P 100 10 10/23 = .434 115 5 5/23 = .22 125 3 3/23 = . 130 90 4 4/23 = .173 85 1 1/23 = .043 2. The formulas for the table above (pg. 2) a. Expected value i. (100 x .434) + (115 x .22) + (125 x .130) + (90 x .173) +
(85 x .043) = 104.18
b. RISK formula i. {(100 – 104.18) 2  x .434)} + {(115 – 104.18) 2  x .22)} +  {(125 – 104.18) 2  x .130)} +{(90 – 104.18) 2  x .173)} + {(85 – 104.18) 2  x .043)} = 11.97 or 12 1. STEP by STEP instructions I. Subtract expected value from each score 100-
104.18
115-
104.18
125-
104.18
90-
104.18
85-
104.18
2

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##### Description: These note cover the following Various types of fictional beasts, monstrous births, and tales of ancient monsters
3 Pages 67 Views 53 Unlocks
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