/*! 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 33 Is the following set of data lik... [FREE SOLUTION] | 91Ó°ÊÓ

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Is the following set of data likely to have come from the geometric pdf, \(p_{X}(k)=(1-p)^{k-1} p\), \(k=1,2, \ldots\) ? $$ \begin{array}{llllllllll} \hline 2 & 8 & 1 & 2 & 2 & 5 & 1 & 2 & 8 & 3 \\ 5 & 4 & 2 & 4 & 7 & 2 & 2 & 8 & 4 & 7 \\ 2 & 6 & 2 & 3 & 5 & 1 & 3 & 3 & 2 & 5 \\ 4 & 2 & 2 & 3 & 6 & 3 & 6 & 4 & 9 & 3 \\ 3 & 7 & 5 & 1 & 3 & 4 & 3 & 4 & 6 & 2 \\ \hline \end{array} $$

Short Answer

Expert verified
By comparing the shape of the dataset (after transformation into a histogram) with the characteristics of a geometric distribution, one can infer if the given set likely follows a geometric pdf or not. It relies heavily on the visual analysis of the dataset.

Step by step solution

01

Data Analysis

Start by calculating the probabilities of the occurrences in the data using the geometric distribution formula. However, seeing that this data-set contains large data, manually doing so might not yield the most accurate results. Instead, a data analysis tool can be used to transform the data into a histogram which will make it easy to compare with a geometric distribution.
02

Compare Data With Geometric Distribution

Upon creating a histogram of the dataset, overlaid with what the data would look like if it followed a geometric distribution, a comparison can be made. The geometric distribution would have a skewed right distribution (Unimodal), with the mode being 1
03

Conclusion

Based on the comparison made in step 2, inferences can be made about whether the data appears to follow a geometric distribution or not. If the data set's shape seems to follow a right-skewed distribution with the mode being 1 and indeed appears similar to a geometric distribution, the set of data is likely to have been generated by a geometric distribution. If not, it is not.

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Key Concepts

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

Probability Density Function
In understanding the probability of different outcomes for a random variable, the concept of a probability density function (pdf) becomes crucial. A pdf details the likelihood of each potential value of this variable. In the case of a geometric distribution, its pdf, denoted as \( p_{X}(k)=(1-p)^{k-1}p \), has a unique characteristic—it reveals the probabilities associated with the number of trials up to and including the first success in a series of independent Bernoulli trials.

For the geometric distribution, each trial is a binary event with only two outcomes: success, with probability \(p\), or failure, with probability \(1-p\). The geometric pdf tightly encapsulates the 'memoryless' property of geometrically-distributed events, where the probability of success is constant regardless of previous outcomes. It's this trait that leads to a skewed-right distribution when plotted, as the probability of needing many trials before the first success diminishes exponentially.

Importantly, for a set of data to follow a geometric distribution, it should visually represent this skewness when illustrated as a histogram. By analyzing the given data and overlaying it on a theoretical geometric pdf graph, as suggested in the exercise, one validates the dataset's adherence to the geometric characteristics.
Data Analysis
Data analysis is an expansive and multifaceted domain, pivotal in unraveling the patterns and inferences that can be drawn from raw data. When provided with a dataset, as in our exercise, it's often necessary to employ statistical methods to digest and comprehend the information. Histograms are an effective visual tool within data analysis to understand frequency distributions, such as the one stemming from a geometric distribution.

Constructing Histograms for Analysis

Creating a histogram transforms raw numerical data into a visual spectrum of bars illustrating the frequency of occurrence for each value. The utility of a histogram is clear when comparing empirical data with a statistical distribution; it allows for a visual inspection of the dataset's consistency with the expected distribution's shape. In the context of this exercise, by creating a histogram of the dataset and superimposing a geometric distribution graph, the congruence between observed and theoretical values can be visually ascertained, facilitating a more tangible analysis of whether the data is likely geometrically distributed.
Statistical Distribution
Statistical distributions are fundamental in characterizing how data points are dispersed over a range of values, and the geometric distribution is a prominent example of a discrete probability distribution. Each statistical distribution carries with it certain properties that describe real-world phenomena. For instance, the geometric distribution is unimodal—it has a single peak—and is always right-skewed, implying that there are fewer occurrences of higher numbers of trials before the first success.

In this exercise's context, the process of fitting a statistical distribution to empirical data is akin to slipping on a glove. If the glove fits well, it signifies that the data's distribution and the theoretical model corresponding to it are in harmony. Hence, following the comparison between the histogram of the given dataset and the shape of the geometric distribution, one could derive conclusions about the nature of the data. A right-skewed, unimodal shape with a mode of 1 in the histogram suggests a geometric characteristic of the dataset, while a noticeable deviation would hint at another underlying distribution at play.

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Most popular questions from this chapter

The Advanced Placement Program allows high school students to enroll in special classes in which a subject is studied at the college level. Proficiency is measured by a national examination. Universities typically grant course credit for a sufficiently strong performance. The possible scores are \(1,2,3,4\), and 5 , with 5 being the highest. The following table gives the probabilities associated with the scores made on a Calculus \(\mathrm{BC}\) test: $$ \begin{array}{cc} \hline \text { Score } & \text { Probability } \\ \hline 1 & 0.146 \\ 2 & 0.054 \\ 3 & 0.185 \\ 4 & 0.169 \\ 5 & 0.446 \\ \hline \end{array} $$ Suppose six students from a class take the test. What is the probability they earn three 5 's, two 4 's, and a 3 ?

Let the vector of random variables \(\left(X_{1}, X_{2}, X_{3}\right)\) have the trinomial pdf with parameters \(n, p_{1}, p_{2}\), and \(p_{3}=\) \(1-p_{1}-p_{2}\). That is, $$ \begin{gathered} P\left(X_{1}=k_{1}, X_{2}=k_{2}, X_{3}=k_{3}\right)=\frac{n !}{k_{1} ! k_{2} ! k_{3} !} p_{1}^{k_{1}} p_{2}^{k_{2}} p_{3}^{k_{3}} \\ k_{i}=0,1, \ldots, n ; \quad i=1,2,3 ; \quad k_{1}+k_{2}+k_{3}=n \end{gathered} $$ By definition, the moment-generating function for \(\left(X_{1}, X_{2}, X_{3}\right)\) is given by $$ M_{X_{1}, X_{2}, X_{3}}\left(t_{1}, t_{2}, t_{3}\right)=E\left(e^{t_{1} X_{1}+t_{2} X_{2}+t_{3} X_{3}}\right) $$ Show that $$ M_{X_{1}, X_{2}, X_{3}}\left(t_{1}, t_{2}, t_{3}\right)=\left(p_{1} e^{t_{1}}+p_{2} e^{t_{2}}+p_{3} e^{t_{3}}\right)^{n} $$

In American football a turnover is defined as a fumble or an intercepted pass. The table below gives the number of turnovers committed by the home team in four hundred forty games. Test that these data fit a Poisson distribution at the \(0.05\) level of significance. $$ \begin{array}{cc} \hline & \text { Number } \\ \text { Turnovers } & \begin{array}{c} \text { Observed } \\ \text { O } \end{array} \\ \hline 0 & 75 \\ 1 & 125 \\ 2 & 126 \\ 3 & 60 \\ 4 & 34 \\ 5 & 13 \\ 6+ & 7 \\ \hline \end{array} $$

An army enlistment officer categorizes potential recruits by IQ into three groups - class I: \(<90\), class II: \(90-110\), and class III: \(>110\). Given that the IQs in the population from which the recruits are drawn are normally distributed with \(\mu=100\) and \(\sigma=16\), calculate the probability that of seven enlistees, two will belong to class I, four to class II, and one to class III.

Show that the common belief in the propensity of babies to choose an inconvenient hour for birth has a basis in observation. A maternity hospital reported that out of one year's total of 2650 births, some 494 occurred between midnight and 4 A.M. (179). Use the goodness-of-fit test to show that the data are not what we would expect if births are assumed to occur uniformly in all time periods. Let \(\alpha=0.05\).

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