BNAD 276 Chapter 2

Stem-and-leaf diagrams can be used to

-Observe individual data points. -Analyze the shape of the data. -Determine how dispersed the data is.

A new dining plan was implemented in a residence hall at SU. Residents were asked to assess the new plan and give a grade of A,B,C,D, or F to the new dining plan. Of 480 residents, 234 gave of grade of B, 85 a grade of C, 13 a grade of D, and 4 a grade of F. The proportion of grades designated as A were _______.

0.30

A new dining plan was implemented in a residence hall at SU. Residents were asked to assess the new plan and give a grade of A,B,C,D, or F, to the new dining plan. Of 480 residents, 234 gave a grade of B, 85 a grade of C, 13 a grade of D, and 4 a grade of F. The number of grades designated as A were

144

One of the primary goals when constructing a frequency distribution for quantitative data is to summarize the data in a manner that:

accurately depicts the data as a whole.

In order to summarize qualitative data, a useful tool is a(n)

frequency distribution

In descriptive statistics, a polygon is nest described as a

graph that plots the midpoints of each class and its associated of frequency or relative frequency

What graphical tool is best used to display the relative frequency of grouped, quantitative data?

histogram

Which of the following graphical depictions are useful to observe the shape (distribution) of the data for a single variable?

histogram polygon stem-and-lead-diagram

A(n) _____ is a segmented circle whose segments portray the relative frequencies of the categories of some qualitative variable.

pie chart

One method of graphical presentation for qualitative data is a(n)

pie chart

Which of the following graphical depictions are useful to observe the shape (distribution) of a data set for a single variable?

polygon histogram stem-and-leaf diagram

A cumulative relative frequency distribution for quantitative data identifies the

proportion of observations that fall below the upper limit of each class.

A ______ is a type of graph that allows researchers to examine the relationship between two variables

scatterplot

In a given cumulative frequency distribution, the "cumulative frequency" column value for the third class represents

the sum of observations in the first, second, and third classes.

an ogive is a graph that plots the cumulative frequency, or cumulative relative frequency, against the

upper limit of the corresponding class

Which of the following best describes a frequency distribution for qualitative data?

It groups data into categories, and records the number of observations in each category.

Histograms can be used for all of the following except:

Observe individual data points. (the actual data points are not observed in a histogram)

Assume that a professor gave an exam to a class of 50 students. The high score was 98 points and the low score was a 48 points. The professor wants to create a frequency distribution that is divided into five classes for the exam scores. The class with for the data is approximately ______ points.

The range divided by the number of classes is (98-48)/5=10

When constructing a graph, which of the following statements is most accurate?

The simplest graph should be used for a given set of data.

With respect to a bar chart, which of the following statements is most accurate?

a bar chart is a useful graphical tool for qualitative data