multiplication rule

(noun)

The probability that A and B occur is equal to the probability that A occurs times the probability that B occurs, given that we know A has already occurred.

Related Terms

  • prosecutor's fallacy
  • sample space

Examples of multiplication rule in the following topics:

  • The Multiplication Rule

  • The Multiplication Rule

    • The multiplication rule states that the probability that AAA and BBB both occur is equal to the probability that BBB occurs times the conditional probability that AAA occurs given that BBB occurs.
    • This rule can be written:
    • We obtain the general multiplication rule by multiplying both sides of the definition of conditional probability by the denominator.
    • That is, in the equation P(A∣B)=P(A∩B)P(B)\displaystyle P(A|B)=\frac{P(A\cap B)}{P(B)}P(A∣B)=​P(B)​​P(A∩B)​​, if we multiply both sides by P(B)P(B)P(B), we obtain the Multiplication Rule.
    • Apply the multiplication rule to calculate the probability of both AAA and BBB occurring
  • General multiplication rule

    • Section 2.1.6 introduced the Multiplication Rule for independent processes.
    • Here we provide the General Multiplication Rule for events that might not be independent.
    • This General Multiplication Rule is simply a rearrangement of the definition for conditional probability in Equation (2.40) on page 83.
    • We will compute our answer using the General Multiplication Rule and then verify it using Table 2.16.
    • Among the 96.08% of people who were not inoculated, 85.88% survived:P(result = lived and inoculated = no) = 0.8588 × 0.9608 = 0.8251 This is equivalent to the General Multiplication Rule.
  • Student Learning Outcomes

  • Summary of Formulas

  • Independence

    • Examples 2.5 and 2.28 illustrate what is called the Multiplication Rule for independent processes.
    • Then we can compute whether a randomly selected person is right-handed and female using the Multiplication Rule:
    • We apply the Multiplication Rule for independent processes to determine the probability that both will be left-handed: 0.09 x 0.09 = 0.0081.
    • Since each are independent, we apply the Multiplication Rule for independent processes: P(all five are RH) = P( first = RH, second = RH, ..., fth = RH) = P( first = RH) x P(second = RH) x...x P( fth = RH) = 0.91 x 0.91 x 0.91 x 0.91 x 0.91 = 0.624 (b) Using the same reasoning as in (a), 0.09 x 0.09 x 0.09 x 0.09 x 0.09 = 0.0000059 (c) Use the complement, P(all five are RH), to answer this question: P(not all RH) = 1 - P(all RH) = 1 - 0:624 = 0:376
  • Counting Rules and Techniques

    • Several useful combinatorial rules or combinatorial principles are commonly recognized and used.
    • The rule of sum (addition rule), rule of product (multiplication rule), and inclusion-exclusion principle are often used for enumerative purposes.
    • The rule of sum is an intuitive principle stating that if there are aaa possible ways to do something, and bbb possible ways to do another thing, and the two things can't both be done, then there are a+ba + ba+b total possible ways to do one of the things.
    • The rule of product is another intuitive principle stating that if there are aaa ways to do something and bbb ways to do another thing, then there are a⋅ba \cdot ba⋅b ways to do both things.
    • The inclusion-exclusion principle is a counting technique that is used to obtain the number of elements in a union of multiple sets.
  • Fundamentals of Probability

    • The most basic and most important rules are listed below.
    • These events are called complementary events, and this rule is sometimes called the complement rule.
    • This is often called the multiplication rule.
    • We consider each of the five rules above in the context of this example.
    • Outline the most basic and most important rules in determining the probability of an event
  • Multiple Regression Models

    • Multiple regression is used to find an equation that best predicts the YYY variable as a linear function of the multiple XXX variables.
    • You use multiple regression when you have three or more measurement variables.
    • One use of multiple regression is prediction or estimation of an unknown YYY value corresponding to a set of XXX values.
    • Multiple regression would give you an equation that would relate the tiger beetle density to a function of all the other variables.
    • As you are doing a multiple regression, there is also a null hypothesis for each XXX variable, meaning that adding that XXX variable to the multiple regression does not improve the fit of the multiple regression equation any more than expected by chance.
  • Interpreting a Confidence Interval

    • For non-standard applications, there are several routes that might be taken to derive a rule for the construction of confidence intervals.
    • Established rules for standard procedures might be justified or explained via several of these routes.
    • Typically a rule for constructing confidence intervals is closely tied to a particular way of finding a point estimate of the quantity being considered.
    • A naive confidence interval for the true mean can be constructed centered on the sample mean with a width which is a multiple of the square root of the sample variance.
    • The confidence interval can be expressed in terms of samples (or repeated samples): "Were this procedure to be repeated on multiple samples, the calculated confidence interval (which would differ for each sample) would encompass the true population parameter 90% of the time. " Note that this does not refer to repeated measurement of the same sample, but repeated sampling.
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