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Use the following cell phone airport data speeds (Mbps) from Sprint. Find the percentile corresponding to the given data speed. $$\begin{array}{llllllllll} 0.2 & 0.3 & 0.3 & 0.3 & 0.3 & 0.3 & 0.3 & 0.4 & 0.4 & 0.4 \\ 0.5 & 0.5 & 0.5 & 0.5 & 0.5 & 0.6 & 0.6 & 0.7 & 0.8 & 1.0 \\ 1.1 & 1.1 & 1.2 & 1.2 & 1.6 & 1.6 & 2.1 & 2.1 & 2.3 & 2.4 \\ 2.5 & 2.7 & 2.7 & 2.7 & 3.2 & 3.4 & 3.6 & 3.8 & 4.0 & 4.0 \\ 5.0 & 5.6 & 8.2 & 9.6 & 10.6 & 13.0 & 14.1 & 15.1 & 15.2 & 30.4 \end{array}$$ \(0.7 \mathrm{Mbps}\)

Short Answer

Expert verified
0.7 Mbps is at the 36th percentile.

Step by step solution

01

- Organize Data

List all the given data speeds in ascending order. The data is already given in ascending order so there's no need to rearrange it.
02

- Determine Position

Find the position of the given data speed in the list. We need to locate the position of 0.7 Mbps in the list. The list has 50 data points, and 0.7 occurs at position 18.
03

- Use the Percentile Formula

Use the percentile formula to find the percentile of 0.7 Mbps. The formula is \(P = \frac{L}{N} \times 100\), where \(P\) is the percentile, \(L\) is the position of the data point, and \(N\) is the total number of data points.
04

- Calculate the Percentile

Substitute the values into the formula: \[P = \frac{18}{50} \times 100 = 36\%\]. So, 0.7 Mbps is at the 36th percentile.

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Key Concepts

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

Percentile Formula
Percentile is an important concept in statistics, providing a way to understand the relative standing of a value within a data set. To calculate the percentile for a given data point, we use the following formula: \textbf{P} = \( \frac{L}{N} \times 100 \), where:
  • \textbf{P} is the percentile of the data point.
  • \textbf{L} is the position of the data point when arranged in ascending order.
  • \textbf{N} is the total number of data points.
To better understand this, let's go step-by-step with the provided example. In our case, the given data speed is 0.7 Mbps. We found its position (L) in the list among 50 data points (N) at the 18th spot. By substituting these values into the formula, we calculated that 0.7 Mbps lies at the 36th percentile. This means 36% of the data points are below 0.7 Mbps, and the remaining 64% are at or above this speed.
Data Organization
Organizing data is key for any statistical analysis. The first step usually involves sorting the given data in ascending order. For the problem at hand, our provided data speeds from Sprint are already arranged in ascending order, which simplifies our task. Having data ordered in a logical sequence allows for efficient calculation of statistical measures, such as percentiles. Properly organized data can help identify trends, make predictions, and support informed decision-making.
For example, to determine the percentile of 0.7 Mbps, we need to know its exact position in the list. If the list were unordered, finding this position would be more complex and time-consuming.
  • The process of sorting the data enables quick identification of any data point.
  • It ensures accuracy and reliability when performing calculations like percentile ranking.
Efficient data organization is not just a theoretical exercise but a practical necessity, especially in fields requiring precise data analysis like finance, healthcare, and telecommunications.
Statistical Analysis
Statistical analysis involves collecting, reviewing, and interpreting data to make informed decisions. In this exercise, we used the concept of percentiles, a common statistical measure to understand the distribution of data. The percentile shows us how a particular value compares to the rest of the data. Here, 0.7 Mbps being at the 36th percentile indicates it is faster than 36% of the other data points but slower than the remaining 64%.
Through statistical analysis, we can draw meaningful insights from complex data sets. Some critical steps include:
  • Identifying key data points and arranging them logically.
  • Deciding on the appropriate statistical measures to apply, like the mean, median, mode, or percentiles.
  • Interpreting these measures to support hypotheses or solve problems.
In real-world applications, such analysis helps in areas like market research, performance assessment, and risk management. Being proficient in basic statistical concepts empowers you to make better decisions based on data, rather than intuition alone. By mastering foundational tools like the percentile formula, you gain the confidence to tackle more complex statistical challenges.

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Most popular questions from this chapter

The harmonic mean is often used as a measure of center for data sets consisting of rates of change, such as speeds. It is found by dividing the number of values \(n\) by the sum of the reciprocals of all values, expressed as $$\frac{n}{\sum \frac{1}{x}}$$ (No value can be zero.) The author drove 1163 miles to a conference in Orlando, Florida. For the trip to the conference, the author stopped overnight, and the mean speed from start to finish was \(38 \mathrm{mi} / \mathrm{h}\). For the return trip, the author stopped only for food and fuel, and the mean speed from start to finish was \(56 \mathrm{mi} / \mathrm{h}\). Find the harmonic mean of \(38 \mathrm{mi} / \mathrm{h}\) and \(56 \mathrm{mi} / \mathrm{h}\) to find the true "average" speed for the round trip.

The 20 brain volumes \(\left(\mathrm{cm}^{3}\right)\) from Data Set 8 "IQ and Brain Size" in Appendix B have a mean of \(1126.0 \mathrm{~cm}^{3}\) and a standard deviation of \(124.9 \mathrm{~cm}^{3}\). Use the range rule of thumb to identify the limits separating values that are significantly low or significantly high. For such data, would a brain volume of \(1440 \mathrm{~cm}^{3}\) be significantly high?

Find the range, variance, and standard deviation for the given sample data. Include appropriate units (such as "minutes") in your results. (The same data were used in Section 3-1, where we found measures of center. Here we find measures of variation.) Then answer the given questions. Listed below are the numbers of heroic firefighters who lost their lives in the United States each year while fighting forest fires. The numbers are listed in order by year, starting with the year 2000 . What important feature of the data is not revealed by any of the measures of variation? $$ \begin{array}{llllllllllllll} 20 & 18 & 23 & 30 & 20 & 12 & 24 & 9 & 25 & 15 & 8 & 11 & 15 & 34 \end{array} $$

Find the range, variance, and standard deviation for the given sample data. Include appropriate units (such as "minutes") in your results. (The same data were used in Section 3-1, where we found measures of center. Here we find measures of variation.) Then answer the given questions. Listed below in dollars are the annual costs of tuition and fees at the 10 most expensive colleges in the United States for a recent year (based on data from U.S. News \& World Report). The colleges listed in order are Columbia, Vassar, Trinity, George Washington, Carnegie Mellon, Wesleyan, Tulane, Bucknell, Oberlin, and Union. What does this "top 10 " list tell us about the variation among costs for the population of all U.S. college tuitions? \(\begin{array}{lllllllll}49,138 & 47,890 & 47,510 & 47,343 & 46,962 & 46,944 & 46,930 & 46,902 & 46,870 & 46,785\end{array}\)

Here are four of the Verizon data speeds (Mbps) from Figure 3-1: \(13.5,10.2,21.1,15.1\). Find the mean and median of these four values. Then find the mean and median after including a fifth value of 142 , which is an outlier. (One of the Verizon data speeds is \(14.2 \mathrm{Mbps}\), but 142 is used here as an error resulting from an entry with a missing decimal point.) Compare the two sets of results. How much was the mean affected by the inclusion of the outlier? How much is the median affected by the inclusion of the outlier?

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