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Ch. 3 - Probability
Larson - Elementary Statistics: Picturing the World 8th Edition
Larson8th EditionElementary Statistics: Picturing the WorldISBN: 9780137493470Not the one you use?Change textbook
All textbooksLarson 8th EditionCh. 3 - ProbabilityProblem 3.2.15
Chapter 3, Problem 3.2.15

"Classifying Events Based on Studies In Exercises 15-18, identify the two events described in the study. Do the results indicate that the events are independent or dependent? Explain your reasoning.
15. A study was conducted to debunk the idea that abilities in music and math are related. Instead, the study showed a strong relationship between achievements in music and math.
(Source: University of Kansas)"

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1
Step 1: Identify the two events described in the study. In this case, the events are 'achievements in music' and 'achievements in math.' These are the two variables being analyzed for their relationship.
Step 2: Understand the concept of independence and dependence in probability. Two events are independent if the occurrence of one event does not affect the probability of the other event occurring. Conversely, events are dependent if the occurrence of one event influences the probability of the other.
Step 3: Analyze the study's findings. The study indicates a strong relationship between achievements in music and math. This suggests that the two events are not independent, as achievements in one area appear to be related to achievements in the other.
Step 4: Explain the reasoning. Since the study shows a strong relationship, it implies that the probability of achieving in music may be influenced by achievements in math, or vice versa. This dependence is supported by the study's conclusion.
Step 5: Conclude that the events are dependent based on the study's findings. The relationship between achievements in music and math indicates that these events are not independent.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Independent and Dependent Events

In probability theory, independent events are those whose occurrence does not affect the probability of another event occurring. Conversely, dependent events are those where the outcome of one event influences the outcome of another. Understanding the distinction between these types of events is crucial for analyzing relationships in studies, such as whether achievements in music and math are related.
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Correlation vs. Causation

Correlation refers to a statistical relationship between two variables, indicating that they tend to move together, while causation implies that one variable directly affects the other. In the context of the study, recognizing whether the strong relationship between music and math achievements is merely correlational or indicative of a causal link is essential for interpreting the results accurately.
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Statistical Significance

Statistical significance assesses whether the results of a study are likely due to chance or if they reflect a true effect in the population. In the context of the study mentioned, determining whether the relationship between music and math achievements is statistically significant helps to validate the findings and supports the conclusion about the nature of the events being independent or dependent.
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Related Practice
Textbook Question

"Classifying Events as Independent or Dependent In Exercises 9-14, determine whether the events are independent or dependent. Explain your reasoning.

12. Not putting money in a parking meter and getting a parking ticket"

Textbook Question

"2. Give an example of

a. two events that are independent.

b. two events that are dependent."

Textbook Question

13. Students A physics class has 40 students. Of these, 12 students are physics majors and 16 students are minoring in math. Of the physics majors, three are minoring in math. Find the probability that a randomly selected student is minoring in math or a physics major.

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Textbook Question

Classifying Events as Independent or Dependent In Exercises 9-14, determine whether the events are independent or dependent. Explain your reasoning.

11. Returning a rented movie after the due date and receiving a late fee

Textbook Question

"Using the Multiplication Rule In Exercises 19-32, use the Multiplication Rule.

22.Pickup Trucks In a survey, 510 U.S. adults were asked whether they drive a pickup truck and whether they drive a Ford. The results showed that three in twenty adults surveyed drive a Ford. Of the adults surveyed that drive Fords, nine in twenty drive a pickup truck. Find the probability that a randomly selected adult drives a Ford and drives a pickup truck.

Textbook Question

"Identifying the Sample Space of a Probability Experiment In Exercises 25-32, identify the sample space of the probability experiment and determine the number of outcomes in the sample space. Draw a tree diagram when appropriate.

26. Guessing a student's letter grade (A, B, C, D, F) in a class

"

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