Transcription of Z-score and Expected Value คะแนนมาตรฐานและค่าความคาดหวัง
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Z-score and Expected Value . Chapter 5. 2 ? ? (Standard score or Z-score ).. (Normal Curve Normal Distribution). (Transform) .. Z ( Z-score ). ( Z-score Equation). x -x x -m Z = s = s . Z . x . x m x . s s (Sigma) ( x ). ( Z-score Equation Meaning). Z x-x = s ( Z-score ) . (Dimensionless Quantity) .. (SD S s Standard Deviation).. E (Appendix E).. 1 . SD. 1. 75 80 10. 2. 75 70 5. 3. 75 65 10.. 75. Z = (75 80)/10 , (75 - 70)/5 , (75 - 65)/10. = , 1, 1 . 2 3 1 2 3. ( z ).. 1 (x - m) 2 /2 s 2. f ( x) = e s p 2.. x = . s = Standard Deviation ( ). m = Mean ( ). p = .. ( ). e = ( ). [ Normal Curve . ]. (Normal Curve). Normal Curve x z 2 . - x ( x).
1.8 0.4641 0.4649 0.4656 0.4664 0.4671 0.4678 0.4686 0.4693 0.4699 0.4706 1.9 0.4713 0.4719 0.4726 0.4732 0.4738 0.4744 0.4750 0.4756 0.4761 0.4767 ตัวอย่าง 5.2 ารผลิตหลอดไฟฟ้าชนิดหนึ่งอง 2 โรงงาน พบว่าอายุารใช้งาน
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