Exam 2: Descriptive Statistics: Tabular and Graphical Methods

A local electronics retailer recently conducted a study on purchasers of large screen televisions.The study recorded the type of television and the credit account balance of the customer at the time of purchase.They obtained the following results. Construct a table of column percentages.

An example of manipulating a graphical display to distort reality is ___________.

When developing a frequency distribution,the class (group)intervals should be ___________.

The number of weekly sales calls by a sample of 25 pharmaceutical salespersons is below. 24,56,43,35,37,27,29,44,34,28,33,28,46,31,38,41,48,38,27,29,37,33,31,40,50 Construct a frequency polygon.

A very simple graph that can be used to summarize a quantitative data set is called a(n)___________.

Which of the following graphical tools is not used to study the shapes of distributions?

A frequency table includes row and column percentages.

Consider the following data on distances traveled by people to visit the local amusement park and calculate the relative frequency for the shortest distance.

A company collected the ages from a random sample of its middle managers,with the resulting frequency distribution shown below. What is the midpoint of the third class interval?

Fill in the missing components of the following frequency distribution constructed for a sample size of 50.

A CFO is looking at how much the company is spending on computing.He samples companies in the pharmaceutical industry and develops the following stem-and-leaf graph. What is the smallest percentage spent on computing?

As a general rule,when creating a stem-and-leaf display,there should be ______ stem values.

If there are 30 values in a data set,how many classes should be created for a frequency histogram?

A company collected the ages from a random sample of its middle managers,with the resulting frequency distribution shown below. What would be the approximate shape of the relative frequency histogram?

The number of measurements falling within a class interval is called the ___________.

A(n)______ is a graph of a cumulative distribution.

A stem-and-leaf display is best used to ___________.

The relative frequency is the frequency of a class divided by the total number of measurements.

The following is a partial relative frequency distribution of grades in an introductory statistics course. Find the relative frequency for the B grade.

The US local airport keeps track of the percentage of flights arriving within 15 minutes of their scheduled arrivals.The stem-and-leaf plot of the data for one year is below. How many flights were used in this plot?