Discrete Uniform Distribution Properties Quiz

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Questions and Answers

What is the formula for the mean of a binomial distribution with parameters n and p?

Mean = n/p

Mean = (1-p)/n

Mean = np (correct)

Mean = p/n

Which distribution describes the number of events occurring assuming they happen with a known constant rate and independently of time since the last event?

Binomial distribution

Normal distribution

Exponential distribution

Poisson distribution (correct)

What is the variance formula of a Poisson distribution?

Variance = 2?

Variance = ?^2

Variance = 1-?

Variance = ? (correct)

In a continuous uniform distribution, what is the likelihood of any value within the range occurring?

Equal likelihood for all values within the range Signup and view all the answers

What does the moment generating function (MGF) describe for a probability distribution?

Mean, variance, and higher moments Signup and view all the answers

Which distribution involves the number of successes in fixed independent trials with the same probability of success?

Binomial distribution Signup and view all the answers

What is the Probability Mass Function (PMF) of a binomial distribution for k successes in n trials?

(kn?)pk(1-p)n?k Signup and view all the answers

Which parameter denotes the average rate of occurrence of events in a Poisson distribution?

? Signup and view all the answers

What does the Taylor series for ex simplify to when calculating the Moment Generating Function for the Poisson distribution?

?=e??e?et=e?(et?1) Signup and view all the answers

If X follows a Poisson distribution, what does X represent?

<h1>of events in a fixed interval</h1> Signup and view all the answers

What is the probability mass function (PMF) for the uniform distribution U(a,b)?

$P(X=x)=\frac{1}{b-a+1}$ Signup and view all the answers

What is the formula for the variance of a Uniform Distribution U(a,b)?

$Var(X)=\frac{(b-a)^2}{12}$ Signup and view all the answers

What does the Moment Generating Function (MGF) of a random variable X help derive?

Mean and Variance Signup and view all the answers

For a discrete random variable X, what does MX(t) represent in the Moment Generating Function equation?

$MX(t)$ is the expectation of $e^{tX}$ Signup and view all the answers

If X follows a Uniform Distribution U(2,10), what is its mean?

$7$ Signup and view all the answers

What is the probability mass function (PMF) value when using a value outside the range of a Uniform Distribution U(a,b)?

$0$ Signup and view all the answers

In the MGF equation, what does $e^{tX}$ represent?

$e^{tX}$ is the random variable transformed by $t$ Signup and view all the answers

When calculating the MGF for a Uniform Distribution U(3,8), what should be the limits of summation?

$3$ to $8$ Signup and view all the answers

For a Uniform Distribution U(4,12), what is the formula for its variance?

$Var(X)=\frac{64}{3}$ Signup and view all the answers

What does the moment generating function MX(t) help to calculate for a random variable X?

$E[e^{tX}]$ Signup and view all the answers

Study Notes

Binomial Distribution

The binomial distribution describes the number of successes in a fixed number of independent Bernoulli trials, where each trial has the same probability of success.
Notation: B(n, p) where n is the number of trials and p is the probability of success.
Probability Mass Function (PMF): P(X=k) = (kn?)pk(1-p)n-k
Mean (μ): μ = np
Variance (σ²): σ² = np(1-p)
Moment Generating Function (MGF): MX(t) = ∑k=0n (etk)(kn?)pk(1-p)n-k

Example: Binomial Distribution (B(5, 0.3))

Mean: μ = 5(0.3) = 1.5
Variance: σ² = 5(0.3)(1-0.3) = 1.05
Moment Generating Function: MX(t) = (0.7 + 0.21et + 0.0153e2t)

Poisson Distribution

The Poisson distribution describes the number of events occurring in a fixed interval of time or space, assuming these events occur with a known constant rate and independently of the time since the last event.
Notation: Poisson(λ)
Probability Mass Function (PMF): P(X=k) = (k!e^(-λ))λ^k
Mean (μ): μ = λ
Variance (σ²): σ² = λ
Moment Generating Function (MGF): MX(t) = e^(λ(et - 1))

Example: Poisson Distribution (Poisson(2))

Mean: μ = 2
Variance: σ² = 2
Moment Generating Function: MX(t) = e^(2(et - 1))

Continuous Uniform Distribution

A continuous uniform distribution is a probability distribution where every value between a certain range has an equal likelihood of occurring.
Notation: U(a, b)
Mean (μ): μ = (a + b) / 2
Variance (σ²): σ² = (b - a)² / 12
Moment Generating Function (MGF): MX(t) = (e^(bt) - e^(at)) / (b - a)