Exam 2: Describing Data: Frequencydistributions and Graphic Presentation

A group of 100 students were surveyed about their interest in a new International Studies program. The survey asked students about their interest in the program in terms of high, medium, or low. 30 Students responded high interest; 50 students responded medium interest; 20 students responded Low interest. What is the relative frequency of students with medium interest?

(i. Pie 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.

(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) If you are constructing a stem-and-leaf display, the "20" in 20.5 would be the leaf.

(i. A frequency table is a grouping of qualitative data into mutually exclusive classes showing the Number of observations in each class. (ii. Simple bar charts may be constructed either horizontally or vertically. (iii) A relative frequency table shows the fraction or percent of the number of observations in each 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 studying the political party preferences of a university's student population. The Survey instrument asked students to identify themselves as a Conservative or NDP. This question is flawed because:

How many employees were absent between 3 to under 6 days?

(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.

What is the relative frequency for those salespersons that earn between $1,600 and $1,799?

The monthly salaries of a sample of 100 employees were rounded to the nearest ten dollars. They Ranged from a low of $1,040 to a high of $1,720. If we want to condense the data into seven classes, What is the most convenient class interval?

(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

The grades on a statistics exam for a sample of students are as follows: How many students wrote this test?

In a simple Frequency Polygon, where is time plotted?

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

What is the relative frequency for those salespersons that earn between $1,500 and $1,800?

The chart below can be best described as

In a frequency distribution, what is the number of observations in a class called?

Given the following stem and leaf plot, determine the smallest value in the data set.

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?

The chart below can be best described as