Exam 2: Describing Data: Frequency Tables, Frequency Distributions, and Graphic Presentation

Refer to the following cumulative frequency distribution on days absent during a calendar year by employees of a manufacturing company: How many employees were absent fewer than six days?

A useful chart or graph to use for illustrating relative frequencies is the ________________.

Refer to the following price of jeans are recorded to the nearest dollar: The first two class midpoints are $62.50 and $65.50. What are the class limits for the third class?

Which of the following would be most helpful if you wished to construct a pie chart?

The grades on a statistics exam for a sample of students are as follows: If A = 80%-100% B = 70%-79% C = 60%-69% D = 50%-59% F =0-49% What is the most common letter grade earned?

Using the frequency table below, determine the relative frequencies for Apartment and Townhouse listings.

The following represent the ages of students in a class: 19, 23, 21, 19, 19, 20, 22, 31, 21, 20 If a stem and leaf plot were to be developed from this, how many stems would there be?

One rule that must always be followed in constructing frequency distributions is that _______.

(i.. The stem in a stem-and-leaf display is the leading digit (ii) There is no loss of information when raw data is tallied into a stem-and-leaf display. (iii). For a stem-and-leaf display, the leaf for the value 98 is 9

Refer to the following chart showing a distribution of exporting firms: For the distribution above, what is the midpoint of the class with the greatest frequency?

Refer to the following distribution of commissions: What is the relative frequency for those salespersons that earn between $1,600 and $1,799?

Refer to the following distribution of ages: What is the class midpoint of the highest class?

(i. In constructing a frequency distribution, you should try to have open-ended classes such as "Under $100" and "$1,000 and over". (ii) To convert a frequency distribution to a relative frequency distribution, divide each class frequency by the sum of the class frequencies. (iii) When constructing a frequency distribution, try to include overlapping stated class limits, such as 100 up to 201, 200 up to 301, and 300 up to 401.

A student was interested in the cigarette smoking habits of college students and collected data from an unbiased random sample of students. The data is summarized in the following table: Why is the table NOT a frequency table?

(i. Simple bar charts may be constructed either horizontally or vertically. (ii) A frequency polygon is a very useful graphic technique when comparing two or more distributions (iii) A cumulative frequency distribution is used when we want to determine how many observations lie above or below certain values.

(i. If you are constructing a stem-and-leaf display, the "20" in 20.5 would be the stem. (ii) An advantage of a stem-and-leaf chart over a histogram is that the identity of each observation is not lost, and that it presents a picture of the distribution. (iii) An advantage of a stem-and-leaf chart over a histogram is that it presents a picture of the distribution.

Refer to the following cumulative frequency distribution on days absent during a calendar year by employees of a manufacturing company: How many employees were absent from 6 to under 12 days?

(i. A frequency distribution is grouping of data into classes showing the number of observations in each class. (ii) The midpoint of a class, which is also called a class mark, is halfway between the lower and upper limits. (iii) A class interval, which is the width of a class, can be determined by subtracting the lower limit of a class from the lower limit of the next higher class.

The following class intervals for a frequency distribution were developed to provide information regarding the starting salaries for students graduating from a particular school: Before data was collected, someone questioned the validity of this arrangement. Which of the following represents a problem with this set of intervals?

(i. Bar charts are useful for showing the percent that various components compose of the total. (ii) Simple bar charts may be constructed either horizontally or vertically. (iii) A bar chart is a graphic representation of a frequency table.