Exam 2: Describing Data: Frequency Tables, Frequency Distributions, 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 low interest?

The following ages (rounded to the nearest whole year) of employees at a large company that were grouped into a distribution with class limits: 20 up to 30 30 up to 40 40 up to 50 50 up to 60 60 up to 70 (i. The class limits for the class 50 up to 60 class are 50 and 58. (ii. The midpoint for the class 40 up to 50 is 45. (iii) The class interval is 10.

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

The grades on a statistics exam for a sample of students are as follows: If A + = 90%-100% A = 80%-89% B+ = 75%-79% B = 70%-74% C+ = 65%-69% C = 60%-64% D+ = 55%-59% D = 50%-54% F = 0-49% What is the most common letter grade earned?

(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 frequency polygon is ideal for showing the trend or sales of income over time.

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 leaves would there be off the second stem?

A row of a stem-and-leaf chart appears as follows: 3 | 0 1 3 5 7 9. Assume that the data is rounded to the nearest unit.

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

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 between 3 to under 6 days?

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. 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.

Refer to the following distribution of commissions: What is the relative frequency of those salespersons that earn more than $1,599?

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:

(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 bar chart is a graphic representation of a frequency table.

The age distribution of a sample of the part-time employees at Lloyd's Fast Food Emporium is: What type of chart has the data been organized to draw?

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 is the class interval?

(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.

Refer to the following distribution of commissions: What is the relative frequency for those salespersons that earn between $1,500 and $1,800?

In constructing a frequency polygon, the class frequencies are scaled on the _____.

When data is collected using a qualitative, nominal variable, i.e., male or female, what is true about a frequency distribution that summarizes the data?