Содержание
- 2. Types of Probability Fundamentals of Probability Statistical Independence and Dependence Expected Value The Normal Distribution Chapter
- 3. Deterministic techniques assume that no uncertainty exists in model parameters. Chapters 2-10 introduced topics that are
- 4. Classical, or a priori (prior to the occurrence), probability is an objective probability that can be
- 5. Subjective probability is an estimate based on personal belief, experience, or knowledge of a situation. It
- 6. An experiment is an activity that results in one of several possible outcomes which are termed
- 7. A frequency distribution is an organization of numerical data about the events in an experiment. A
- 8. State University, 3000 students, management science grades for past four years. Fundamentals of Probability A Frequency
- 9. A marginal probability is the probability of a single event occurring, denoted by P(A). For mutually
- 10. Figure 11.1 Venn Diagram for Mutually Exclusive Events Fundamentals of Probability Mutually Exclusive Events & Marginal
- 11. Probability that non-mutually exclusive events A and B or both will occur expressed as: P(A or
- 12. Figure 11.2 Venn diagram for non–mutually exclusive events and the joint event Fundamentals of Probability Non-Mutually
- 13. Can be developed by adding the probability of an event to the sum of all previously
- 14. A succession of events that do not affect each other are independent events. The probability of
- 15. For coin tossed three consecutive times Figure 11.3 Statistical Independence and Dependence Independent Events – Probability
- 16. Properties of a Bernoulli Process: There are two possible outcomes for each trial. The probability of
- 17. A binomial probability distribution function is used to determine the probability of a number of successes
- 18. Determine probability of getting exactly two tails in three tosses of a coin. Statistical Independence and
- 19. Microchip production; sample of four items per batch, 20% of all microchips are defective. What is
- 20. Four microchips tested per batch; if two or more found defective, batch is rejected. What is
- 21. Figure 11.4 Dependent events Statistical Independence and Dependence Dependent Events (1 of 2)
- 22. If the occurrence of one event affects the probability of the occurrence of another event, the
- 23. Unconditional: P(H) = .5; P(T) = .5, must sum to one. Figure 11.5 Another set of
- 24. Conditional: P(R|H) =.33, P(W|H) = .67, P(R|T) = .83, P(W|T) = .17 Statistical Independence and Dependence
- 25. Given two dependent events A and B: P(A|B) = P(AB)/P(B) With data from previous example: P(RH)
- 26. Figure 11.7 Probability tree with marginal, conditional and joint probabilities Statistical Independence and Dependence Summary of
- 27. Table 11.1 Joint probability table Statistical Independence and Dependence Summary of Example Problem Probabilities
- 28. In Bayesian analysis, additional information is used to alter the marginal probability of the occurrence of
- 29. Machine setup; if correct there is a 10% chance of a defective part; if incorrect, a
- 30. Posterior probabilities: Statistical Independence and Dependence Bayesian Analysis – Example (2 of 2)
- 31. When the values of variables occur in no particular order or sequence, the variables are referred
- 32. Machines break down 0, 1, 2, 3, or 4 times per month. Relative frequency of breakdowns
- 33. The expected value of a random variable is computed by multiplying each possible value of the
- 34. Variance is a measure of the dispersion of a random variable’s values about the mean. Variance
- 35. Standard deviation is computed by taking the square root of the variance. For example data [E(x)
- 36. A continuous random variable can take on an infinite number of values within some interval. Continuous
- 37. The normal distribution is a continuous probability distribution that is symmetrical on both sides of the
- 38. Mean weekly carpet sales of 4,200 yards, with a standard deviation of 1,400 yards. What is
- 39. - - Figure 11.9 The normal distribution for carpet demand The Normal Distribution Example (2 of
- 40. The area or probability under a normal curve is measured by determining the number of standard
- 41. The Normal Distribution Standard Normal Curve (2 of 2) Figure 11.10 The standard normal distribution
- 42. Figure 11.11 Determination of the Z value The Normal Distribution Example (3 of 5) Z =
- 43. Determine the probability that demand will be 5,000 yards or less. Z = (x - μ)/σ
- 44. The Normal Distribution Example (5 of 5) Figure 11.13 Normal distribution with P(3000 yards ≤ x
- 45. The population mean and variance are for the entire set of data being analyzed. The sample
- 46. The Normal Distribution Computing the Sample Mean and Variance Sample mean Sample variance Sample variance shortcut
- 47. Sample mean = 42,000/10 = 4,200 yd Sample variance = [(190,060,000) - (1,764,000,000/10)]/9 = 1,517,777 Sample
- 48. It can never be simply assumed that data are normally distributed. The chi-square test is used
- 49. In the test, the actual number of frequencies in each range of frequency distribution is compared
- 50. Armor Carpet Store example - assume sample mean = 4,200 yards, and sample standard deviation =1,232
- 51. Figure 11.14 The theoretical normal distribution The Normal Distribution Example of Chi-Square Test (2 of 6)
- 52. Table 11.2 The determination of the theoretical range frequencies The Normal Distribution Example of Chi-Square Test
- 53. The Normal Distribution Example of Chi-Square Test (4 of 6) Comparing theoretical frequencies with actual frequencies:
- 54. Table 11.3 Computation of χ2 test statistic The Normal Distribution Example of Chi-Square Test (5 of
- 55. χ2k-p-1 = Σ(fo - ft)2/10 = 2.588 k - p -1 = 6 - 2 –
- 56. Exhibit 11.1 Statistical Analysis with Excel (1 of 2) Click on “Data” tab on toolbar; then
- 57. Statistical Analysis with Excel (2 of 2) Exhibit 11.2 Cells with data Indicates that the first
- 58. Radcliff Chemical Company and Arsenal. Annual number of accidents is normally distributed with mean of 8.3
- 59. Set up the normal distribution. Example Problem Solution Solution (1 of 3)
- 60. Solve Part 1: P(x ≤ 5 accidents) and P(x ≥ 10 accidents). Z = (x -
- 61. Solve Part 2: P(x ≥ 12 accidents) Z = 2.06, corresponding to probability of .4803. P(x
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