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Construct a stem and leaf plot for these 50 measurements and answer the questions. $$ \begin{array}{llllllllll} 3.1 & 4.9 & 2.8 & 3.6 & 2.5 & 4.5 & 3.5 & 3.7 & 4.1 & 4.9 \\ 2.9 & 2.1 & 3.5 & 4.0 & 3.7 & 2.7 & 4.0 & 4.4 & 3.7 & 4.2 \\ 3.8 & 6.2 & 2.5 & 2.9 & 2.8 & 5.1 & 1.8 & 5.6 & 2.2 & 3.4 \\ 2.5 & 3.6 & 5.1 & 4.8 & 1.6 & 3.6 & 6.1 & 4.7 & 3.9 & 3.9 \\ 4.3 & 5.7 & 3.7 & 4.6 & 4.0 & 5.6 & 4.9 & 4.2 & 3.1 & 3.9 \end{array} $$ Use the stem and leaf plot to find the smalles observation.

Short Answer

Expert verified
Answer: The smallest observation is 1.6.

Step by step solution

01

Arrange the given data in ascending order

First, arrange the 50 measurements in ascending order. This step will make it easier to construct the stem and leaf plot. After arranging, the ordered measurements are: $$ \begin{array}{llllllllll} 1.6 & 1.8 & 2.1 & 2.2 & 2.5 & 2.5 & 2.5 & 2.7 & 2.8 & 2.8 \\ 2.9 & 2.9 & 3.1 & 3.1 & 3.4 & 3.5 & 3.5 & 3.6 & 3.6 & 3.6 \\ 3.7 & 3.7 & 3.7 & 3.7 & 3.8 & 3.9 & 3.9 & 3.9 & 3.9 & 4.0 \\ 4.0 & 4.0 & 4.1 & 4.2 & 4.2 & 4.3 & 4.4 & 4.5 & 4.6 & 4.7 \\ 4.8 & 4.9 & 4.9 & 4.9 & 5.1 & 5.1 & 5.6 & 5.6 & 5.7 & 6.1 \\ 6.2 \end{array} $$
02

Construct the stem and leaf plot

Now, construct the stem and leaf plot using the ordered data. The "stem" will be the whole number part (1, 2, 3, 4, 5, 6) and the "leaf" will be the decimal part. This plot should look like: $$ \begin{array}{c|c} \text{Stem} & \text{Leaf} \\ \hline 1 & 6\,8 \\ 2 & 1\,2\,5\,5\,5\,7\,8\,8\,9\,9 \\ 3 & 1\,1\,4\,5\,5\,6\,6\,6\,7\,7\,7\,7\,8\,9\,9\,9\,9 \\ 4 & 0\,0\,0\,1\,2\,2\,3\,4\,5\,6\,7\,8\,9\,9\,9 \\ 5 & 1\,1\,6\,6\,7 \\ 6 & 1\,2 \\ \end{array} $$
03

Identify the smallest observation

Find the smallest observation from the constructed stem and leaf plot. As we can see, the smallest observation is in the stem "1" with leaf "6", so the smallest observation is 1.6.

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Key Concepts

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

Data Visualization
Visualizing data transforms raw numbers into an easy-to-digest graphical format. One common technique is a stem and leaf plot. This method offers a clear representation of data frequency and distribution. It uses stems (for tens digits) and leaves (for units digits) to group data. This structure lets you see the shape and concentration of the data quickly.

The main advantage is clarity. Unlike a list of numbers, the plot visually bundles similar values together. This makes it easier to spot patterns or anomalies. For instance, you can instantly identify where most data points cluster, providing insights into central tendencies.

In short, stem and leaf plots offer a handy way to turn complex data into simple visuals. This is excellent for identifying trends and making informed decisions at a glance.
Descriptive Statistics
Descriptive statistics involve summarizing data to derive meaningful information. When using a stem and leaf plot, you can readily extract key statistical values like the median, mode, or range without further computations.

The arrangement of data in a stem and leaf plot helps streamline this process by displaying all data points in an ordered format. With a quick glance, you can determine which values appear most frequently and where the middle of the dataset lies.

This form of statistical analysis is preliminary. It provides a foundation for deeper exploration using inferential statistics. However, even at this basic level, it gives a snapshot of how data behaves and what key values need focus.
Ordered Data
Once data is collected, organizing it is a crucial step. Ordered data means arranging values from smallest to largest. This sequence makes patterns and outliers more visible.

When data is ordered, creating plots like stem and leaf becomes straightforward. This makes subsequent analysis more effective, as it lays out data in a clear, logical manner. The process removes chaos from the dataset and simplifies tracking changes or anomalies.

With ordered data, identifying extremes, calculating stats like medians, or even forming ranges becomes less daunting. The whole exercise enhances your insight and understanding of the dataset's structure.
Smallest Observation
Finding the smallest observation is often a primary task in data assessment. This figure tells you the lower bound of your data set. In the stem and leaf plot, identifying this number is intuitive.

The smallest observation appears as the first item in the plot. In our example, the number 1.6 appears first, indicating it's the lowest value. Knowing this value helps set the stage for understanding the dataset's range and spread.

Tracking the smallest observation is crucial in contexts like quality control, where deviations from norms matter greatly. The simplicity of a stem and leaf plot makes it easy to pinpoint this value without sweeping calculations.

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Most popular questions from this chapter

Construct a relative frequency histogram for these 50 measurements using classes starting at 1.6 with a class width of .5. Then answer the questions. $$\begin{array}{llllllllll}3.1 & 4.9 & 2.8 & 3.6 & 2.5 & 4.5 & 3.5 & 3.7 & 4.1 & 4.9 \\ 2.9 & 2.1 & 3.5 & 4.0 & 3.7 & 2.7 & 4.0 & 4.4 & 3.7 & 4.2 \\ 3.8 & 6.2 & 2.5 & 2.9 & 2.8 & 5.1 & 1.8 & 5.6 & 2.2 & 3.4 \\ 2.5 & 3.6 & 5.1 & 4.8 & 1.6 & 3.6 & 6.1 & 4.7 & 3.9 & 3.9 \\ 4.3 & 5.7 & 3.7 & 4.6 & 4.0 & 5.6 & 4.9 & 4.2 & 3.1 & 3.9\end{array}$$ What fraction of the measurements are from 2.6 up to but not including \(4.6 ?\)

In an opinion poll conducted by \(A B C\) News, nearly \(80 \%\) of the teens said they were not interested in being the president of the United States. \(^{2}\) When asked "What's the main reason you would not want to be president?" they gave the responses as follows: Other career plans/no interest \(40 \%\) Too much pressure \(20 \%\) Too much work \(15 \%\) Wouldn't be good at it \(14 \%\) Too much arguing \(5 \%\) a. Are all of the reasons accounted for in this table? Add another category if necessary. b. Would you use a pie chart or a bar chart to graphically describe the data? Why? c. Draw the chart you chose in part b. d. If you were the person conducting the opinion poll, what other types of questions might you want to investigate?

Construct a line chart to describe the data and answer the questions. A psychologist measured the length of time it took for a rat to get through a maze on each of 5 days. Do you think that any learning is taking place? $$ \begin{array}{l|lllll} \text { Day } & 1 & 2 & 3 & 4 & 5 \\ \hline \text { Time (seconds) } & 45 & 43 & 46 & 32 & 25 \end{array} $$

The following table lists the ages at the time of death for the 38 deceased American presidents from George Washington to Ronald Reagan': $$ \begin{array}{ll|ll} \text { Washington } & 67 & \text { Arthur } & 57 \\ \text { J. Adams } & 90 & \text { Cleveland } & 71 \\ \text { Jefferson } & 83 & \text { B. Harrison } & 67 \\ \text { Madison } & 85 & \text { McKinley } & 58 \\ \text { Monroe } & 73 & \text { T. Roosevelt } & 60 \\ \text { J. Q. Adams } & 80 & \text { Taft } & 72 \\ \text { Jackson } & 78 & \text { Wilson } & 67 \\ \text { Van Buren } & 79 & \text { Harding } & 57 \\ \text { W. H. Harrison } & 68 & \text { Coolidge } & 60 \\ \text { Tyler } & 71 & \text { Hoover } & 90 \\ \text { Polk } & 53 & \text { F.D. Roosevelt } & 63 \\ \text { Taylor } & 65 & \text { Truman } & 88 \\ \text { Fillmore } & 74 & \text { Eisenhower } & 78 \\ \text { Pierce } & 64 & \text { Kennedy } & 46 \\ \text { Buchanan } & 77 & \text { L. Johnson } & 64 \\ \text { Lincoln } & 56 & \text { Nixon } & 81 \\ \text { A.Johnson } & 66 & \text { Ford } & 93 \\ \text { Grant } & 63 & \text { Reagan } & 93 \\ \text { Hayes } & 70 & & \\ \text { Garfield } & 49 & & \end{array} $$ a. Before you graph the data, think about the distribution of the ages at death for the presidents. What shape do you think it will have? b. Draw a stem and leaf plot for the data. Describe the shape. Does it surprise you? c. The five youngest presidents at the time of death appear in the lower "tail" of the distribution. Identify these five presidents. d. Three of the five youngest have one thing in common. What is it?

Construct a relative frequency histogram for these 20 measurements on a discrete variable that can take only the values \(0, I,\) and 2. Then answer the questions. $$ \begin{array}{lllll} 1 & 2 & 1 & 0 & 2 \\ 2 & 1 & 1 & 0 & 0 \\ 2 & 2 & 1 & 1 & 0 \\ 0 & 1 & 2 & 1 & 1 \end{array} $$ What proportion of the measurements are greater than \(1 ?\)

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