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An experiment with three outcomes has been repeated 50 times, and it was learned that \(E_{1}\) occurred 20 times, \(E_{2}\) occurred 13 times, and \(E_{3}\) occurred 17 times. Assign probabilities to the outcomes. What method did you use?

Short Answer

Expert verified
Probabilities: \(P(E_1) = 0.4\), \(P(E_2) = 0.26\), \(P(E_3) = 0.34\). Method: Relative Frequency.

Step by step solution

01

Understand the Problem

We need to determine the probabilities of three outcomes based on their frequencies in 50 trials. We'll use the Relative Frequency Method to assign probabilities, given that each outcome has been observed a different number of times.
02

Calculate the Total Number of Trials

Count the total number of experiments conducted. In this case, it's already given as 50 trials.
03

Calculate Probability of Each Outcome

Assign the probability to each outcome using the formula for probability: \[ P(E_i) = \frac{\text{Number of times } E_i \text{ occurred}}{\text{Total number of trials}} \]For each outcome:- For \(E_1\): \[ P(E_1) = \frac{20}{50} = 0.4 \]- For \(E_2\): \[ P(E_2) = \frac{13}{50} = 0.26 \]- For \(E_3\): \[ P(E_3) = \frac{17}{50} = 0.34 \]
04

Verify the Probabilities

Ensure that the sum of the probabilities equals 1, which checks the consistency of the probabilities calculated:\[ P(E_1) + P(E_2) + P(E_3) = 0.4 + 0.26 + 0.34 = 1 \] The sum is 1, validating our results.
05

Determine the Method Used

Conclude the method used for calculating the probabilities. In this case, it's the **Relative Frequency Method**, which assigns probabilities based on the frequency of occurrence of each outcome.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Probability Calculation
Probability calculation is about determining the likelihood of different outcomes in an experiment. In many real-world scenarios, as with our example, the Relative Frequency Method is often used. This method calculates probability by comparing the frequency of each outcome to the total number of trials conducted.

For instance, consider an experiment with three outcomes, denoted as \(E_1\), \(E_2\), and \(E_3\), repeatedly tested in 50 trials. By counting how often each outcome occurs, these frequencies can be turned into probabilities:
  • Outcome \(E_1\) occurred 20 times.
  • Outcome \(E_2\) appeared 13 times.
  • Outcome \(E_3\) showed up 17 times.
The probability of any given outcome \(E_i\) is found using the formula: \[ P(E_i) = \frac{\text{Number of times } E_i \text{ occurred}}{\text{Total number of trials}} \]This calculation is straightforward once the frequencies and total number of trials are known, leading to probabilities for each outcome of 0.4, 0.26, and 0.34, respectively.
Frequency Distribution
Frequency distribution is a way to organize data to show how often each outcome occurs. It's an important part of statistical analysis as it gives a clear picture of how data is spread across different categories. In experiments like the one detailed here, frequency distribution helps in calculating probabilities.

By laying out frequencies, you can see exactly how outcomes compare. For example, in our case:
  • \(E_1\) occurred 20 times.
  • \(E_2\) happened 13 times.
  • \(E_3\) occurred 17 times.
This breakdown is essential for making comparisons and drawing conclusions. By translating these frequencies into probabilities, we gain insights into the likelihood of different events occurring, which is crucial for decision-making processes and predictions. Frequency distribution is the underpinning step that guides the probability calculations moving forward.
Statistical Methods
Statistical methods encompass a range of techniques used to analyze data, and one commonly used method is the Relative Frequency Method. This method is particularly well-suited for experiments where outcomes can be reliably tracked, as it bases probability calculations on the experimental data itself.

These methods are invaluable in various fields such as business, healthcare, and social sciences, aiding in risk assessment, predictions, and data-driven decisions. When using the Relative Frequency Method, it's crucial to have reliable frequency data:
  • Every occurrence is counted, contributing to the overall statistical model.
  • It provides a realistic picture of how likely an event is, based on past occurrences.
Applying this method correctly ensures that probabilities accurately reflect empirical evidence from the data, enhancing the reliability of your analysis. Understanding how the Relative Frequency Method fits into broader statistical methodologies can empower you to analyze data more comprehensively.

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Most popular questions from this chapter

Simple random sampling uses a sample of size \(n\) from a population of size \(N\) to obtain data that can be used to make inferences about the characteristics of a population. Suppose that, from a population of 50 bank accounts, we want to take a random sample of 4 accounts in order to learn about the population. How many different random samples of 4 accounts are possible?

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Statistics from the 2009 Major League Baseball season show that there were 157 players who had at least 500 plate appearances. For this group, 42 players had a batting average of 300 or higher, 53 players hit 25 or more home runs, and 14 players had a batting average of .300 or higher and hit 25 or more home runs. Only four players had 200 or more hits (ESPN website, January 10,2010 ). Use the 157 players who had at least 500 plate appearances to answer the following questions. a. What is the probability that a randomly selected player had a batting average of .300 or higher? b. What is the probability that a randomly selected player hit 25 or more home runs? c. Are the events having a batting average of .300 or higher and hitting 25 or more home runs mutually exclusive? d. What is the probability that a randomly selected player had a batting average of .300 or higher or hit 25 or more home runs? e. What is the probability that a randomly selected player had 200 or more hits? Does obtaining 200 or more hits appear to be more difficult than hitting 25 or more home runs? Explain.

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