3-1 introduction experiment random random experiment
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3-1 Introduction
• Experiment
• Random
• Random experiment
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3-1 Introduction
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3-1 Introduction
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3-1 Introduction
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3-1 Introduction
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3-2 Random Variables
• In an experiment, a measurement is usually denoted by a variable such as X.
• In a random experiment, a variable whose measured value can change (from one replicate of the experiment to another) is referred to as a random variable.
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3-2 Random Variables
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3-3 Probability
• Used to quantify likelihood or chance
• Used to represent risk or uncertainty in engineering applications
•Can be interpreted as our degree of belief or relative frequency
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3-3 Probability
• Probability statements describe the likelihood that particular values occur.
• The likelihood is quantified by assigning a number from the interval [0, 1] to the set of values (or a percentage from 0 to 100%).
• Higher numbers indicate that the set of values is more likely.
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3-3 Probability
• A probability is usually expressed in terms of a random variable. • For the part length example, X denotes the part length and the probability statement can be written in either of the following forms
• Both equations state that the probability that the random variable X assumes a value in [10.8, 11.2] is 0.25.
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3-3 Probability
Complement of an Event• Given a set E, the complement of E is the set of elements that are not in E. The complement is denoted as E’.
Mutually Exclusive Events• The sets E1 , E2 ,...,Ek are mutually exclusive if the intersection of any pair is empty. That is, each element is in one and only one of the sets E1 , E2 ,...,Ek .
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3-3 Probability
Probability Properties
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3-3 Probability
Events• A measured value is not always obtained from an experiment. Sometimes, the result is only classified (into one of several possible categories). • These categories are often referred to as events.
Illustrations •The current measurement might only be recorded as low, medium, or high; a manufactured electronic component might be classified only as defective or not; and either a message is sent through a network or not.
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3-4 Continuous Random Variables
3-4.1 Probability Density Function
• The probability distribution or simply distribution of a random variable X is a description of the set of the probabilities associated with the possible values for X.
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3-4 Continuous Random Variables
3-4.1 Probability Density Function
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3-4 Continuous Random Variables
3-4.1 Probability Density Function
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3-4 Continuous Random Variables
3-4.1 Probability Density Function
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3-4 Continuous Random Variables
3-4.1 Probability Density Function
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3-4 Continuous Random Variables
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3-4 Continuous Random Variables
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3-4 Continuous Random Variables
3-4.2 Cumulative Distribution Function
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3-4 Continuous Random Variables
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3-4 Continuous Random Variables
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3-4 Continuous Random Variables
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3-4 Continuous Random Variables
3-4.3 Mean and Variance
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3-4 Continuous Random Variables
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3-5 Important Continuous Distributions
3-5.1 Normal Distribution
Undoubtedly, the most widely used model for the distribution of a random variable is a normal distribution.
• Central limit theorem• Gaussian distribution
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3-5 Important Continuous Distributions
3-5.1 Normal Distribution
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3-5 Important Continuous Distributions
3-5.1 Normal Distribution
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3-5 Important Continuous Distributions
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3-5 Important Continuous Distributions
3-5.1 Normal Distribution
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3-5 Important Continuous Distributions
3-5.1 Normal Distribution
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3-5 Important Continuous Distributions
3-5.1 Normal Distribution
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3-5 Important Continuous Distributions
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3-5 Important Continuous Distributions
3-5.1 Normal Distribution
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3-5 Important Continuous Distributions
3-5.1 Normal Distribution
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3-5 Important Continuous Distributions
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3-5 Important Continuous Distributions
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3-5 Important Continuous Distributions
3-5.2 Lognormal Distribution
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3-5 Important Continuous Distributions
3-5.2 Lognormal Distribution
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3-5 Important Continuous Distributions
3-5.3 Gamma Distribution
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3-5 Important Continuous Distributions
3-5.3 Gamma Distribution
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3-5 Important Continuous Distributions
3-5.3 Gamma Distribution
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3-5 Important Continuous Distributions
3-5.4 Weibull Distribution
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3-5 Important Continuous Distributions
3-5.4 Weibull Distribution
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3-5 Important Continuous Distributions
3-5.4 Weibull Distribution
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3-6 Probability Plots
3-6.1 Normal Probability Plots• How do we know if a normal distribution is a reasonable model for data?
• Probability plotting is a graphical method for determining whether sample data conform to a hypothesized distribution based on a subjective visual examination of the data.
• Probability plotting typically uses special graph paper, known as probability paper, that has been designed for the hypothesized distribution. Probability paper is widely available for the normal, lognormal, Weibull, and various chi- square and gamma distributions.
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3-6 Probability Plots
3-6.1 Normal Probability Plots
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3-6 Probability Plots
3-6.1 Normal Probability Plots
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3-6 Probability Plots
3-6.2 Other Probability Plots
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3-6 Probability Plots
3-6.2 Other Probability Plots
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3-6 Probability Plots
3-6.2 Other Probability Plots
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3-6 Probability Plots
3-6.2 Other Probability Plots
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3-7 Discrete Random Variables
• Only measurements at discrete points are possible
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3-7 Discrete Random Variables
3-7.1 Probability Mass Function
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3-7 Discrete Random Variables
3-7.1 Probability Mass Function
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3-7 Discrete Random Variables
3-7.1 Probability Mass Function
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3-7 Discrete Random Variables
3-7.2 Cumulative Distribution Function
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3-7 Discrete Random Variables
3-7.2 Cumulative Distribution Function
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3-7 Discrete Random Variables
3-7.3 Mean and Variance
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3-7 Discrete Random Variables
3-7.3 Mean and Variance
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3-7 Discrete Random Variables
3-7.3 Mean and Variance
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3-8 Binomial Distribution
• A trial with only two possible outcomes is used so frequently as a building block of a random experiment that it is called a Bernoulli trial.
• It is usually assumed that the trials that constitute the random experiment are independent. This implies that the outcome from one trial has no effect on the outcome to be obtained from any other trial.
• Furthermore, it is often reasonable to assume that the probability of a success on each trial is constant.
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3-8 Binomial Distribution• Consider the following random experiments and
random variables. • Flip a coin 10 times. Let X = the number of heads obtained.• Of all bits transmitted through a digital transmission
channel, 10% are received in error. Let X = the number of bits in error in the next 4 bits transmitted.
Do they meet the following criteria:1. Does the experiment consist of
Bernoulli trials? 2. Are the trials that constitute the
random experiment are independent?
3. Is probability of a success on each trial is constant?
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3-8 Binomial Distribution
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3-8 Binomial Distribution
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3-8 Binomial Distribution
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3-9 Poisson Process
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3-9 Poisson Process3-9.1 Poisson Distribution
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3-9 Poisson Process
3-9.1 Poisson Distribution
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3-9 Poisson Process
3-9.1 Poisson Distribution
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3-9 Poisson Process
3-9.1 Poisson Distribution
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3-9 Poisson Process
3-9.1 Poisson Distribution
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3-9 Poisson Process
3-9.2 Exponential Distribution
• The discussion of the Poisson distribution defined a random variable to be the number of flaws along a length of copper wire. The distance between flaws is another random variable that is often of interest. • Let the random variable X denote the length from any starting point on the wire until a flaw is detected.• As you might expect, the distribution of X can be obtained from knowledge of the distribution of the number of flaws. The key to the relationship is the following concept:
The distance to the first flaw exceeds 3 millimeters if and only if there are no flaws within a length of 3 millimeters—simple, but sufficient for an analysis of the distribution of X.
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3-9 Poisson Process
3-9.2 Exponential Distribution
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3-9 Poisson Process
3-9.2 Exponential Distribution
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3-9 Poisson Process
3-9.2 Exponential Distribution
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3-9 Poisson Process
3-9.2 Exponential Distribution• The exponential distribution is often used in reliability studies as the model for the time until failure of a device.
• For example, the lifetime of a semiconductor chip might be modeled as an exponential random variable with a mean of 40,000 hours. The lack of memory property of the exponential distribution implies that the device does not wear out. The lifetime of a device with failures caused by random shocks might be appropriately modeled as an exponential random variable.
• However, the lifetime of a device that suffers slow mechanical wear, such as bearing wear, is better modeled by a distribution that does not lack memory.
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3-10 Normal Approximation to the Binomial and Poisson Distributions
Normal Approximation to the Binomial
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3-10 Normal Approximation to the Binomial and Poisson Distributions
Normal Approximation to the Binomial
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3-10 Normal Approximation to the Binomial and Poisson Distributions
Normal Approximation to the Binomial
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3-10 Normal Approximation to the Binomial and Poisson Distributions
Normal Approximation to the Poisson
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3-11 More Than One Random Variable and Independence
3-11.1 Joint Distributions
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3-11 More Than One Random Variable and Independence
3-11.1 Joint Distributions
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3-11 More Than One Random Variable and Independence
3-11.1 Joint Distributions
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3-11 More Than One Random Variable and Independence
3-11.1 Joint Distributions
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3-11 More Than One Random Variable and Independence
3-11.2 Independence
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3-11 More Than One Random Variable and Independence3-11.2 Independence
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3-11 More Than One Random Variable and Independence3-11.2 Independence
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3-11 More Than One Random Variable and Independence3-11.2 Independence
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3-12 Functions of Random Variables
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3-12 Functions of Random Variables
3-12.1 Linear Combinations of Independent Random Variables
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3-12 Functions of Random Variables
3-12.1 Linear Combinations of Independent Random Variables
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3-12 Functions of Random Variables
3-12.1 Linear Combinations of Independent Random Variables
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3-12 Functions of Random Variables
3-12.2 What If the Random Variables Are Not Independent?
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3-12 Functions of Random Variables
3-12.2 What If the Random Variables Are Not Independent?
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3-12 Functions of Random Variables
3-12.3 What If the Function Is Nonlinear?
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3-12 Functions of Random Variables
3-12.3 What If the Function Is Nonlinear?
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3-12 Functions of Random Variables
3-12.3 What If the Function Is Nonlinear?
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3-13 Random Samples, Statistics, and The Central Limit Theorem
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3-13 Random Samples, Statistics, and The Central Limit Theorem
Central Limit Theorem
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3-13 Random Samples, Statistics, and The Central Limit Theorem
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3-13 Random Samples, Statistics, and The Central Limit Theorem
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3-13 Random Samples, Statistics, and The Central Limit Theorem
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