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# Prob & Stats: Chpt.2

TermDefinition
Class Limits the span of values that can be counted in a particular class.
Class Boundaries numbers used to separate the class so there are no gaps in the frequency distribution.
Midpoint Formula Xm = lower limit + upper limit/ 2
State what is needed for the CATEGORICAL frequency distribution table. class, frequency, and percents (cf).
State what is needed for the GROUPED frequency distribution table. limits, boundaries, f, cf, and cf boundaries.
State what is needed for the UNGROUPED frequency distribution table. one number, boundaries, f, cf, cf boundaries.
List the three things that can make a graph misleading. 1. 3-D pictures, 2-D pictures 2. Labeling y-axis to make a point or not 3. Omitting labels or units on the axis of a graph.
List the rules to follow for class width. 1. Between 5-20 classes. 2. Be an odd number 3. Classes must be mutually exclusive. 4. Classes must be continuous - no gaps. 5. Classes must be exhaustive.
List the reasons for constructing a frequency distribution. 1. To organize data in a meaningful intelligible way. 2. To enable readers to determine the shape of the distribution. 3. To help with computations like the measure of average. 4. To enable readers to draw charts and graphs. 5. To enable readers to compare different data sets.
What is the purpose of graphs? to convey the data to the viewers in graphical form.
List the uses of graphs. 1. To describe and analyze data. 2. To get the audiences attention. 3. To discuss on an issue. 4. To reinforce a critical point. 5. To summarize a data set.
What does the relative frequency represent in a graph? Proportions instead of raw data as frequencies.
How do you find the relative frequency? f/n = _____ (2 decimal places)
List the three most commonly used graphs. 1. Histogram 2. Frequency Polygon 3. Ogive
Class a qualitative or quantitative category that raw data is placed into.
Frequency the number of data values that are contained in a particular class.
Frequency Distribution the organization of raw data in table form, using classes and frequency.
Class Width distance between consecutive lower limits (boundaries) and consecutive upper limits (boundaries).
Created by: ashtmcda