/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} Problem 11 Let \(x\) be the number of succe... [FREE SOLUTION] | 91Ó°ÊÓ

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Let \(x\) be the number of successes observed in a sample of \(n=5\) items selected from a population of \(N=10 .\) Suppose that of the \(N=10\) items, \(M=6\) are considered "successes." Find the probabilities in Exercises \(11-13 .\) The probability of observing no successes.

Short Answer

Expert verified
Answer: The probability of observing no successes in a sample of 5 items is 0.

Step by step solution

01

Identify the known values

In this problem, these are given: - x (number of successes in the sample) = 0 - n (number of items selected) = 5 - N (population size) = 10 - M (number of successes in the population) = 6
02

Apply the hypergeometric distribution formula

We will plug in the values from Step 1 into the formula: P(0) = \(\frac{\binom{6}{0}\binom{10-6}{5-0}}{\binom{10}{5}}\)
03

Compute the binomial coefficients

\(\binom{6}{0} = 1\) \(\binom{10-6}{5-0} = \binom{4}{5} = 0\) (since 5 > 4) \(\binom{10}{5} = 252\)
04

Substitute the binomial coefficients into the formula

P(0) = \(\frac{1 \cdot 0}{252}\)
05

Calculate the probability

P(0) = \(\frac{0}{252} = 0\) So the probability of observing no successes in a sample of 5 items is 0.

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Key Concepts

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

Understanding Probability
Probability is a measure of the likelihood that a particular event will occur. It's a fundamental concept in statistics and it's used in various forms of data analysis and real-world decision making. In the context of the hypergeometric distribution used in the exercise, the probability tells us how likely it is to observe a specific number of successes when we randomly select a sample from a population.

In the given exercise, we're interested in the likelihood of seeing no successes in our sample. We calculate this probability using the hypergeometric distribution formula. The result indicates the chance of a particular outcome happening, which, as we determined in this case, is zero. This means that it's impossible, given our scenario, to not have any successes in our sample based on the population and sample sizes.
Decoding Binomial Coefficients
Binomial coefficients, often represented by \( \binom{n}{k} \), are an integral part of combinatorics, which is the study of counting. They tell us the number of ways we can choose a subset of items from a larger set, regardless of the order of the items. This concept is crucial for calculating probabilities in problems involving combinations, like the hypergeometric distribution problem.

In the solution, we calculated several binomial coefficients to find out how many ways we could select a subset of 'successes' and 'failures' from the population. One of those coefficients, \( \binom{4}{5} \), turned out to be zero, which makes sense because it's impossible to pick 5 items from a set of only 4. Understanding how binomial coefficients work and how to calculate them is key for solving this type of probability problem.
The Role of Statistical Sampling in Probability
Statistical sampling is the process of selecting a subset (a sample) of individuals from within a statistical population to estimate characteristics of the whole population. There are different types of sampling methods, and the hypergeometric distribution arises specifically in scenarios without replacement, meaning once an item is selected, it cannot be chosen again.

The exercise provides a classic example of statistical sampling where we have a finite population and we want to understand the probability of a certain outcome when we cannot sample with replacement. It illustrates the importance of sampling in practical scenarios like quality control or wildlife population estimation. By using sampling, we are able to make informed guesses about larger populations based on smaller, more manageable subsets.

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Most popular questions from this chapter

A fire-detection device uses three temperature-sensitive cells acting independently of one another so that any one or more can activate the alarm. Each cell has a probability \(p=.8\) of activating the alarm when the temperature reaches \(57^{\circ} \mathrm{C}\) or higher. Let \(x\) equal the number of cells activating the alarm when the temperature reaches \(57^{\circ} \mathrm{C}\). a. Find the probability distribution of \(x\). b. Find the probability that the alarm will function when the temperature reaches \(57^{\circ} \mathrm{C}\). c. Find the expected value and the variance for the random variable \(x\).

A piece of electronic equipment contains six computer chips, two of which are defective. Three computer chips are randomly chosen for inspection, and the number of defective chips is recorded. Find the probability distribution for \(x,\) the number of defective computer chips. Compare your results with the answers obtained in Exercise 26 (Section 5.1).

Explain why \(x\) is or is not a binomial random variable. (Hint: compare the characteristics of this experiment with those of a binomial experiment given in this section.) If the experiment is binomial, give the value of \(n\) and \(p\), if possible. Two balls are randomly selected with replacement from a jar that contains three red and two white balls. The number \(x\) of red balls is recorded.

Explain why \(x\) is or is not a binomial random variable. (Hint: compare the characteristics of this experiment with those of a binomial experiment given in this section.) If the experiment is binomial, give the value of \(n\) and \(p\), if possible. A market research firm hires operators to conduct telephone surveys. The computer randomly dials a telephone number, and the operator asks the respondent whether or not he has time to answer some questions. Let \(x\) be the number of telephone calls made until the first respondent is willing to answer the operator's questions.

A shipping company knows that the cost of delivering a small package within 24 hours is \(\$ 14.80 .\) The company charges \(\$ 15.50\) for shipment but guarantees to refund the charge if delivery is not made within 24 hours. If the company fails to deliver only \(2 \%\) of its packages within the 24 -hour period, what is the expected gain per package?

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