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14 Cards in this Set

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How do you determine the number of classes for a frequency distribution?

2^k where 2^k >= n

How do you determine relative frequency?

# observation / total

A set of data consists of 38 observations. How many classes would you recommend for the frequency distribution?

2^k >= 38



k = 6

How do you determine class intervals?

i >= (h - l / k)



h = highest observation


l = lowest observation


k = class

A grouping of qualitative data into mutually exclusive classes showing the number of observations in each class is known as a ______________.

frequency table

A grouping of quantitative data into mutually exclusive classes showing the number of observations in each class is known as ___________.

frequency distribution

A graph in which the classes for a qualitative data are reported on the horizontal axis and the class frequencies (proportional to the heights of the bars) on the vertical axis is called ____________.

bar chart

A _________ chart shows the proportion or percent that each class represents of the total.

pie chart

A graph in which the classes of a quantitative data set are marked on the horizontal axis and the class frequencies on the vertical axis is called a _____________.

histogram or frequency polygon

A set of data contained 70 observations. How many classes would you suggest to construct a frequency distribution?

2^k >= 70



k = 7



7 classes

The distance between successive lower class limits is called ________.

class intervals

The average of the respective class limits of two consecutive classes is the ___________.

mid-point

In a relative frequency distribution, the class frequencies are divided by ________.

the total number of observations

A cumulative frequency polygon is created by line segments connecting the ____________ and the corresponding cumulative frequencies.

upper class limits