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Ch. 3 - Probability
Larson - Elementary Statistics: Picturing the World 8th Edition
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Tutti i libri di testoLarson 8th EditionCh. 3 - ProbabilityProblema 3.RE.22
Capitolo 3, Problema 3.RE.22

In Exercises 19-22, determine whether the events are independent or dependent. Explain your reasoning.
22. Getting high grades and being awarded an academic scholarship

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Understand the definition of independent and dependent events: Two events are independent if the occurrence of one event does not affect the probability of the other event occurring. Conversely, two events are dependent if the occurrence of one event affects the probability of the other event occurring.
Identify the two events in the problem: Event A is 'getting high grades,' and Event B is 'being awarded an academic scholarship.'
Analyze the relationship between the two events: Consider whether achieving high grades (Event A) influences the likelihood of being awarded an academic scholarship (Event B).
Recognize that academic scholarships are often awarded based on academic performance, which means that getting high grades (Event A) increases the probability of being awarded a scholarship (Event B).
Conclude that the events are dependent because the occurrence of Event A (getting high grades) directly affects the likelihood of Event B (being awarded an academic scholarship).

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Independent Events

Independent events are those whose outcomes do not affect each other. In probability, two events A and B are independent if the occurrence of A does not change the probability of B occurring, and vice versa. For example, flipping a coin and rolling a die are independent events because the result of one does not influence the other.
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Probability of Multiple Independent Events

Dependent Events

Dependent events are those where the outcome of one event affects the outcome of another. In probability, two events A and B are dependent if the occurrence of A changes the probability of B occurring. For instance, drawing cards from a deck without replacement is a classic example of dependent events, as the first draw affects the composition of the deck for the second draw.
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Probability of Multiple Independent Events

Conditional Probability

Conditional probability is the probability of an event occurring given that another event has already occurred. It is denoted as P(A|B), which represents the probability of event A occurring given that event B has occurred. Understanding conditional probability is crucial for determining whether events are independent or dependent, as it helps assess how the occurrence of one event influences the likelihood of another.
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Introduction to Probability
Pratica correlata
Domanda del libro di testo

In Exercises 7-12, classify the statement as an example of classical probability, empirical probability, or subjective probability. Explain your reasoning.

11. The probability of rolling 2 six-sided dice and getting a sum of 9 is 1/9.

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In Exercises 25 and 26, determine whether the events are mutually exclusive. Explain your reasoning.

25. Event A: Randomly select a red jelly bean from a jar.

Event B: Randomly select a yellow jelly bean from the jar.

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In Exercises 7-12, classify the statement as an example of classical probability, empirical probability, or subjective probability. Explain your reasoning.

8. The probability of randomly selecting five cards of the same suit from a standard deck of 52 playing cards is about 0.002.

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39. You are given that P(A) = 0.15 and P(B) = 0.40. Do you have enough information to find P(A or B)? Explain.

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Domanda del libro di testo

In Exercises 29-32, find the probability.

31. A 12-sided die, numbered 1 to 12, is rolled. Find the probability that the roll results in an odd number or a number less than 4.

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In Exercises 35–38, the bar graph shows the results of a survey in which 8806 undergraduate students were asked how many hours they spend on studying and other academic activities outside of class in a typical week. (Source: American College Health Association)

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37. Find the probability of randomly selecting an undergraduate who does not study from 6 to 10 hours per week.

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