Exam 2: Describing Data: Frequencydistributions and Graphic Presentation

(i. For a stem-and-leaf display, the leaf for the value 98 is 9. (ii. There is some loss of information when raw data is tallied into a stem-and-leaf display. (iii) A cumulative frequency distribution is used when we want to determine how many observations Lie above or below certain values.

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 and60. (ii. The midpoint for the class 40 up to 50 is 45. (iii) The class interval is 10.

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?

What are the class limits for the $55 up to $65 class?

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

What is the relative class frequency for the $25 up to $35 class?

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. A frequency distribution is grouping of data into classes showing the number of observations in Each class. (ii. In constructing a frequency distribution, you should try to have open-ended classes such as "Under $100" and "$1,000 and over". (iii) A cumulative frequency distribution is used when we want to determine how many observations Lie above or below certain values.

What are the class limits for the class with the smallest number of frequencies?

If the enrolment for this Faculty of Business remained constant at 625 between 2000 and 2001, Determine the change in the enrolment in the School of Accounting during this time.

Monthly commissions of first-year insurance brokers are $1,270, $1,310, $1,680, $1,380, $1,410, $1,570, $1,180 and $1,420. These figures are referred to as:

(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 Frequency Polygon is ideal for showing the trend or sales of income over time.

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?

The head of the statistics department wants to determine the number of mistake made by students In their first online assignment. She gathers information from her classes of the past year. The approximate range (distance from the minimum value in the raw data up to the maximum value) Of the data is _________.

Consider the following relative frequency distribution: If there are 2,000 numbers in the data set, how many of the values are less than 30?

What is the class midpoint for the $45 up to $55 class?

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.

How many employees were absent from 6 to under 12 days?

The Lake Ontario Credit Union selected a sample of 40 student chequing accounts. Below is a chart Of their end-of-the-month balances. The bank considers any student with an ending balance of $400 or more a "preferred customer". Estimate the number of preferred customers in this sample.

The relative frequency for a class is computed as