Stats assignments 2

When a class interval is expressed as 100 up to 200

Observations with values of 200 are excluded from the class

A student was studying the political party preferences of a university's student population. The survey instrument asked students to identify their political preference, for example, Democrat, Republican, Libertarian, or another party. The best way to illustrate the frequencies for each political preference is a

bar chart

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

frequency

What is the following table called? ages, number of ages.

frequency distribution

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

Frequency

The monthly salaries of a sample of 100 employees were rounded to the nearest $10. 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?

$100

A group of 100 students was surveyed about their interest in a new International Studies program. Interest was measured in terms of high, medium, or low. In the study, 30 students responded high interest, 40 students responded medium interest, and 30 students responded low interest. What is the relative frequency of students with high interest?

.30

When data is collected using a qualitative, nominal variable, what is true about a frequency distribution that summarizes the data?

A pie chart can be used to summarize the data

True or false: To convert a frequency distribution to a relative frequency distribution, divide each class frequency by the number of classes.

False

For a relative frequency distribution, relative frequency is computed as

The class frequency divided by the total frequency.

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 distribution?

The classes are not mutually exclusive

True or false: A frequency polygon is a very useful graphic technique when comparing two or more distributions.

True

True or false: In frequency distributions, classes are mutually exclusive if each individual, object, or measurement is included in only one category.

True

The relative frequency for a class represents the

percent of observations in the class