Classical and Axiomatic Approaches in Probability Theory
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Questions and Answers

What is the main difference between the classical and axiomatic approaches to defining probability?

  • The classical approach is non-normative, while the axiomatic approach is normative.
  • The classical approach is based on equally likely outcomes, while the axiomatic approach is based on fundamental principles. (correct)
  • The classical approach defines probability through a set of axioms, while the axiomatic approach relies on total number of possible outcomes.
  • The classical approach was introduced by Andrey Kolmogorov, while the axiomatic approach is a more recent development.

Which mathematician played a key role in introducing the axiomatic approach to defining probability?

  • Carl Friedrich Gauss
  • Andrey Kolmogorov (correct)
  • Blaise Pascal
  • Leonhard Euler

According to the classical approach, how is the probability of an event calculated?

  • $P(E) = n(E) + n(S)$
  • $P(E) = n(E) - n(S)$
  • $P(E) = n(S) - n(E)$
  • $P(E) = \frac{n(E)}{n(S)}$ (correct)

Which of the following is one of the basic axioms in the axiomatic approach to defining probability?

<p>Non-negativity (C)</p> Signup and view all the answers

In the classical approach, what does it mean when outcomes are assumed to be equally likely?

<p>Each outcome in the sample space has an equal chance of occurring. (C)</p> Signup and view all the answers

What does the normalization axiom state in the axiomatic approach to defining probability?

<p>The probability of the entire sample space is 1. (A)</p> Signup and view all the answers

What does the probability mass function (PMF) provide for a discrete random variable?

<p>The probability of each possible value (D)</p> Signup and view all the answers

How is the expected value of a discrete random variable calculated?

<p>Sum of each possible value weighted by its probability (D)</p> Signup and view all the answers

Which function helps analyze the distribution of discrete random variables?

<p>Probability generating function (PGF) (D)</p> Signup and view all the answers

What type of convergence is associated with the weak law of large numbers?

<p>Convergence in probability (D)</p> Signup and view all the answers

What does the strong law of large numbers state about sample averages?

<p>Converges almost surely to expected value (A)</p> Signup and view all the answers

What does the Law of Total Probability state?

<p>The total probability of an event can be expressed as the sum of the probabilities of A given each partition Bi. (B)</p> Signup and view all the answers

What is compound probability?

<p>The probability of the intersection of two or more events. (A)</p> Signup and view all the answers

How is compound probability calculated for independent events A and B?

<p>$P(A \cap B) = P(A) \times P(B)$ (B)</p> Signup and view all the answers

What is conditional probability?

<p>The likelihood of an event occurring given that another event has already occurred. (C)</p> Signup and view all the answers

In Bayes' theorem, what does P(B|A) represent?

<p>The likelihood of observing evidence B given that hypothesis A is true. (C)</p> Signup and view all the answers

How can compound probability be calculated for dependent events A and B?

<p>$P(A \cup B) = P(A|B) \times P(B)$ (D)</p> Signup and view all the answers

According to the Central Limit Theorem, as the sample size increases, what distribution does the sample mean approach?

<p>Normal distribution (D)</p> Signup and view all the answers

What is the main application of the Central Limit Theorem in statistics?

<p>Construction of confidence intervals (B)</p> Signup and view all the answers

In the context of joint distributions, what does the marginal distribution describe?

<p>Probability distribution of one variable without considering others (D)</p> Signup and view all the answers

Which property must the joint probability mass function satisfy for discrete random variables?

<p>$fX,Y(x,y) &gt; 0$ for all $x$ and $y$ (D)</p> Signup and view all the answers

What concept describes the relationship between two random variables in terms of how they change together?

<p>Covariance (A)</p> Signup and view all the answers

How are conditional distributions derived from joint distributions?

<p>By dividing the joint distribution by the marginal distribution (D)</p> Signup and view all the answers

What is the formula to calculate the marginal PMF of X for discrete random variables?

<p>P(X=x) = ∑y P(X=x, Y=y) (A)</p> Signup and view all the answers

How is the conditional PMF of X given Y=y obtained for continuous random variables?

<p>$P(X=x|Y=y) = fX,Y?(x,y) / fY?(y)$ (A)</p> Signup and view all the answers

What does the conditional distribution of one random variable given the value of another random variable represent?

<p>The distribution of the first variable when the second variable is fixed at a specific value (C)</p> Signup and view all the answers

For discrete random variables, how is the conditional PMF obtained?

<p>By dividing the joint PMF by the marginal PMF of the conditioned variable (B)</p> Signup and view all the answers

What is the formula to calculate the marginal PDF of X for continuous random variables?

<p>$fX?(x) = ∫ fX,Y?(x,y) dy$ (C)</p> Signup and view all the answers

How can the conditional PDF of X given Y=y be described for continuous random variables?

<p>$fX?Y?(x?y) = fY?(y)/fX,Y?(x,y)$ (C)</p> Signup and view all the answers

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