2.1 Stem-and-Leaf Graphs (Stemplots), Line Graphs, and Bar Graphs

Splitting each value into stem and leaf so the raw numbers stay visible, and choosing line or bar displays for change over time and for category counts.

Introductory Statistics 2e, 2.1 Stem-and-Leaf Graphs (Stemplots), Line Graphs, and Bar Graphs

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4 exercises

NOTE

The data are the distances (in kilometers) from a home to local supermarkets. Create a stemplot using the data:
1.1; 1.5; 2.3; 2.5; 2.7; 3.2; 3.3; 3.3; 3.5; 3.8; 4.0; 4.2; 4.5; 4.5; 4.7; 4.8; 5.5; 5.6; 6.5; 6.7; 12.3

Do the data seem to have any concentration of values?

The leaves are to the right of the decimal.

2.5

Presidential Ages at Inauguration

A side-by-side stem-and-leaf plot allows a comparison of the two data sets in two columns. In a side-by-side stem-and-leaf plot, two sets of leaves share the same stem. The leaves are to the left and the right of the stems. the table and the table show the ages of presidents at their inauguration and at their death. Construct a side-by-side stem-and-leaf plot using this data.

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2.1 Exercise 11

For each of the following data sets, create a stem plot and identify any outliers.

The miles per gallon rating for 30 cars are shown below (lowest to highest).
19, 19, 19, 20, 21, 21, 25, 25, 25, 26, 26, 28, 29, 31, 31, 32, 32, 33, 34, 35, 36, 37, 37, 38, 38, 38, 38, 41, 43, 43

2.5

2.1 Exercise 13

For each of the following data sets, create a stem plot and identify any outliers.

The data are the prices of different laptops at an electronics store. Round each value to the nearest ten.
249, 249, 260, 265, 265, 280, 299, 299, 309, 319, 325, 326, 350, 350, 350, 365, 369, 389, 409, 459, 489, 559, 569, 570, 610

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