BNAD 276 Chapter 2

A stem-and-leaf diagram has two parts : The stem and the leaf. The stem consists of the ? and the leaf consists of the...

leftmost digits; last digit.

A pie chart is a segmented circle whose segments, when summed equal ? degrees.

360

Stem-and-leaf diagrams can be used to?

-analyze the shape of the data -observe individual data points -determine how dispersed the data is.

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.

To construct a frequency distribution for qualitative data, the data is split into

categories

Relative frequency distributions are generally more useful than frequency distributions when

comparing data sets of different sizes.

How does an ogive differ from a polygon?

An ogive is a graph of cumulative frequency distribution, while a polygon is a graph of a relative frequency distribution.

A(n) depicts the frequency or the relative frequency for each category of a qualitative variable as a series of horizontal or vertical bars, the lengths of which are proportional to the values that are to be depicted.

Bar chart

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

Histogram

Which of the following graphical depictions is useful for observing the spread of the data for a single variable?

Histogram

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.

Which graph displays cumulative data?

Ogive

In order to approximate class width for a frequency distribution of quantitative data, we calculate:

(largest value-smallest value) / n

Stem-and-leaf diagrams can be used to

-analyze the shape of the data -observe individual data points -determine how dispersed the data is.

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

-histogram -polygon

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

.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

The pictured scatterplot depicts ? between the x and y variable

A positive linear relationship.

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.

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

frequency distribution

In descriptive statistics, a polygon is best described as a

graph that plots the midpoints of each class of a frequency distribution.

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

pie chart

The pictured histogram shows the distribution of the data can be best described as:

positively skewed, or skewed right.

A cumulative relative frequency distribution for quantitative data identifies the

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

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.