Stemplots

Literacy of men and women

The Islamic world is attracting increased attention in Europe and North America. The table below shows the percentage of men and women at least 15 years old who were literate in 2002 in the major Islamic nations. We omitted countries with populations of less than 3 million. Data for a few nations, such as Afghanistan and Iraq, are not available.

To make a stemplot of the percentage of females who are literate, use the first digits as stems and the second digits as leaves. Algeria’s 60% literacy rate, for example, appears as the leaf 0 on the stem 6. The figure below shows the steps in making the plot.

Country	Female percent	Male percent
Algeria	60	78
Bangladesh	31	50
Egypt	46	68
Iran	71	85
Jordan	86	96
Kazakhstan	99	100
Lebanon	82	95
Libya	71	92
Malaysia	85	92
Morocco	38	68
Saudi Arabia	70	84
Syria	63	89
Tajikistan	99	100
Tunisia	63	83
Turkey	78	94
Uzbekistan	99	100
Yemen	29	70

Making a stemplot of the data in the table.

Write the stems.
Go through the data and write each leaf on the proper stem. For example, the values on the 8 stem are 86, 82, and 85 in the order of the table.
Arrange the leaves on each stem in order out from the stem. The 8 stem
now has leaves 2 5 6.

$stemplot.gif$

Acknowledged

POINTS (1)

Correct Answer

Explanation

A ___________ (also called a stem-and-leaf plot) gives a quick picture of the shape of a distribution while including the actual numerical values in the graph

Missing

POINTS (1)

Correct Answer

Explanation

Stemplots work best for a large number of observations that are all greater than 100

True

False

POINTS (1)

Correct Answer

Explanation

To make a stemplot

Order the following steps to make a stemplot

(1)	Write the stems in a vertical column with the smallest at the top and draw a vertical line at the right of this column.
(2)	Separate each observation into a stem consisting of all but the final (rightmost) digit and a leaf, the final digit. Stems may have as many digits as needed, but each leaf contains only a single digit.
(3)	Write each leaf in the row to the right of its stem, in increasing order out from the stem.

drag and drop the selected option to the right place

Second

First

Third

POINTS (1)

Correct Answer

Explanation

We can compare two related distributions, as shown below, using a _________ stemplot

$compare_stemplot.gif$

end-to-end

last-to-end

back-to-back

first-to-last

POINTS (1)

Correct Answer

Explanation

In order to use stemplots with a moderate number of observations, you can double the number of stems in a plot by splitting each stem into two

one with leaves 0 to 4 and the other with leaves 5 to 9

one with leaves 0 to 3 and the other with leaves 4 to 9

one with leaves 0 to 6 and the other with leaves 7 to 9

one with leaves 0 to 5 and the other with leaves 6 to 9

POINTS (1)