Exam 2: Describing Data: Frequency Distributions and Graphic Presentation

Refer to 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. -The class interval is ___________.

Refer to 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 What is the class interval and the midpoint of the first class?

Refer to the following chart showing a distribution of exporting firms: -What percentage of the firms export less than $14 million in product?

(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.

The chart below can be best described as

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.

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

The monthly incomes of a small sample of computer operators are $1,950, $1,775, $2,060, $1,840, $1,795, $1,890, $1,925 and $1,810. What are these ungrouped numbers called?

The chart below can be best described as

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

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?

Refer to the following distribution of commissions: -The first plot for a cumulative greater than frequency distribution should be:

Quinn's Café serves ice cream. She asks 100 of her regular customers to take a taste test and pick the flavour they like the best. The results are shown in the following table. Is the data quantitative or qualitative? What is the name of the table shown?

-Comparing the values province wide, business students across the province and across Seneca College, which of these three groups has the larger proportion of students under 21?

Refer to the following distribution of ages: -For the distribution of ages above, what is the relative class frequency for the lowest class?

Refer to 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. -IQs were tested for a number of students. The first three IQs are 105, 115, and 125. The upper limit for the third class ___________s .

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

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?

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) 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.