Ch.3 Graphical Descriptive Techniques II

Question 1

histogram

Answer 1

is the most commonly used graph to show frequency distributions of interval data

Question 2

A histogram is created by drawing rectangles

Answer 2

The bases of the rectangles are the class intervals

The heights of the rectangles are the frequencies for each class

Question 3

Histograms with too many class intervals

Answer 3

don’t summarize the data enough for a clear visualization

Question 4

Histograms with too few class intervals

Answer 4

oversummarize the data, and so some details of the distribution may be lost

Question 5

Sturges’s formula can be used

Answer 5

to give the ideal number of class intervals for a set of data

Question 6

Sturges’s formula

Answer 6

Number of classes = 1 + 3.3 log (n)

Question 7

an ogive is a graphical representation of which of the following?

a. frequencies.
b. relative frequencies.
c. cumulative frequencies.
d. cumulative relative frequencies.

Answer 7

c. cumulative frequencies.

Question 8

Interval data is graphically represented by which of the following?

a. A bar chart.
b. A histogram.
c. A pie chart.
d. All of these choices are true.

Answer 8

b. A histogram.

Question 9

On a cumulative relative frequency distribution, what values are shown?

a. The number of observations that fall into each class interval.
b. The proportion of observations that fall into each class interval.
c. The number of observations that fall below each class interval.
d. The proportion of observations that fall below each class interval.

Answer 9

d. The proportion of observations that fall below each class interval.