Ch.2 Graphical Descriptive Techniques I

Question 1

Nominal data

Answer 1

is data which can be divided into labeled categories that do not overlap.

Question 2

Ordinal data

Answer 2

is nominal data which can be ranked (put into order). Ordinal data does NOT contain information about the distances between these ranked categories.

Question 3

Interval data

Answer 3

measures (or counts) a quantity, amount, or range. Calculations can be performed on this type of data

Question 4

frequency distribution

Answer 4

describes the number of data values that fall within each category.

Question 5

relative frequency distribution

Answer 5

describes the proportion of data values that fall within each category.

Question 6

Proportion (p)

Answer 6

= frequency in a category / total number of observations

p=f/n

NOTE: Proportion and relative frequency mean the same thing.

Question 7

Bar Chart

Answer 7

Displays the frequencies of a nominal variable as bars on a graph. The height of each bar represents the frequency of the corresponding category.

Question 8

Pie Chart

Answer 8

Displays the relative frequencies (proportions) of a nominal variable as wedge-shaped sections of a circle. The size of each section represents the proportion of the corresponding category.

Question 9

modal class

Answer 9

more observations than any other category

Question 10

For which data type are values simply arbitrary numbers (they do not
represent measurements or quantitites)?

Answer 10

nominal

Question 11

Which format best displays two nominal variables?
a. cross-classification table.
b. frequency distribution table.
c. cumulative percentage distribution table.
d. scatter diagram.

Answer 11

a. cross-classification table.

Question 12

Categories and their counts are listed on a relative frequency
distribution.

True
False

Answer 12

False