Chapter 2 - Stem-and-Leaf Plot

Question 1

The following data represents the number of printer ribbons used annually in a company by twenty-eight departments. This is an example ___ data.
8 4 5 10 6 5 4 6 3 4 4 6 1 12
2 11 2 5 3 2 6 7 6 12 7 1 8 9

Answer 1

Raw or Ungrouped

Question 2

Below is a frequency distribution of ages of managers with a large retail firm. This is an example of \_\_\_\_ data.
Age        f
20-29  11
30-39  32
40-49  57
50-59  43

Answer 2

Grouped

Question 3

For best results, a frequency distribution should hav between ___ and ___ classes

Answer 3

5 & 15

Question 4

The difference between the largest and smallest numbers is called the ___.

Answer 4

Range

Question 5

Consider the vale’s below. In constructing a frequency distribution, the beginning Point of the lowest class should be at least as small as ___ and the endpoint of the highest class should be at least as large as ___ .

27 21 8 10 9 16 11 12 21 11 29 19 17 22 28 28 29 19 18 26 17 34 19 16 20

Answer 5

8 and 34

Also Min and Max

Question 6

The class midpoint can be determined by ___.

Answer 6

Mean, or average of the two class endpoints

Question 7

The relative frequency for the class 15-under 20 is \_\_\_?
class               Freq
5-under 10     56
10-under 15   43
15-under 20   21
20-under 25   11
25-under 30   12
30-under 35    8

Answer 7

21 /(151) or .1391

Question 8

The cumulative frequency for the class 20-under 25 is ___?

class               Freq
5-under 10     56
10-under 15   43
15-under 20   21
20-under 25   11
25-under 30   12
30-under 35    8

Answer 8

56+43+21+11 = 131

Question 9

The midpoint for the class 25-under 30 is ___?

class               Freq
5-under 10     56
10-under 15   43
15-under 20   21
20-under 25   11
25-under 30   12
30-under 35    8

Answer 9

27.5

Question 10

The graphical depiction that is a type of vertical bar chart and is used to depict a frequency distribution is a ___.

Answer 10

Histogram

Question 11

The graphical depiction that utilizes cumulative frequencies is a ____?

Answer 11

Ogive

Question 12

Consider the categories below and their relative amounts:

Category.               Amount
        A.                          112
        B.                          319
        C.                            57
         D.                          148
        E.                           202
If you were to construct a Pie Chart to depict these categories, then you would allot \_\_\_\_\_ degrees to Category D.

Answer 12

63.58 degrees

Question 13

A graph that is especially useful for observing the overall shape of the distribution of data points along with identifying data values or intervals for which there are groupings and gaps in the data is called a ___

Answer 13

Dot plot

Question 14

Given the values below, construct a stem and leaf plot using two digits for the stem.

Answer 14

Stem(values, scale = 2)

Question 15

A vertical bar chart that displays the most common types of defects that occur with a product, ranked in order from left to right is called a ___

Answer 15

Pareto chart

Question 16

A process that produces a two-dimensional table to display the frequency counts for two variables simultaneously is called a ___

Answer 16

Cross Tabulation

Question 17

A two-dimensional plot of pairs of points often used to examine the relationship of two numerical variables is called a ___

Answer 17

Scatter plot