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# Prob & Stats: Chpt.2

Term | Definition | ||||
---|---|---|---|---|---|

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). |

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