# AP Statistics Curriculum 2007 EDA Freq

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===Summarizing data with Frequency Tables & Histograms=== | ===Summarizing data with Frequency Tables & Histograms=== | ||

- | + | There are two ways to describe a data set (sample from a population) - Pictorial Graphs or Tables of Numbers. Both are important for analyzing data. | |

- | + | ||

- | + | <center>[[Image:AP_Statistics_Curriculum_2007_IntroVar_Dinov_061407_Fig1.png|500px]]</center> | |

- | + | ||

- | * | + | ===Definitions=== |

+ | * A '''frequency distribution''' is a display of the number (frequency) of occurrences of each value in a data set. | ||

+ | * A '''relative frequency''' distribution is a display of the percent (ratio or frequency to sample-size) of occurrences of each value in a data set. | ||

- | === | + | ===Example=== |

- | + | Stage of disease at diagnosis of breast cancer in a random sample of US women. | |

- | + | {| class="wikitable" | |

+ | |- | ||

+ | ! Stage | ||

+ | ! Frequency | ||

+ | ! Relative Frequency | ||

+ | |- | ||

+ | | 0 | ||

+ | | 197 | ||

+ | | 0.09 | ||

+ | |- | ||

+ | | I | ||

+ | | 691 | ||

+ | | 0.33 | ||

+ | |- | ||

+ | | II | ||

+ | | 703 | ||

+ | | 0.34 | ||

+ | |- | ||

+ | | III | ||

+ | | 314 | ||

+ | | 0.15 | ||

+ | |- | ||

+ | | IV | ||

+ | | 187 | ||

+ | | 0.09 | ||

+ | |- | ||

+ | | Total | ||

+ | | 2092 | ||

+ | | 1.00 | ||

+ | |} | ||

===Computational Resources: Internet-based SOCR Tools=== | ===Computational Resources: Internet-based SOCR Tools=== |

## Revision as of 19:09, 27 January 2008

## Contents |

## General Advance-Placement (AP) Statistics Curriculum - Summarizing data with Frequency Tables

### Summarizing data with Frequency Tables & Histograms

There are two ways to describe a data set (sample from a population) - Pictorial Graphs or Tables of Numbers. Both are important for analyzing data.

### Definitions

- A
**frequency distribution**is a display of the number (frequency) of occurrences of each value in a data set. - A
**relative frequency**distribution is a display of the percent (ratio or frequency to sample-size) of occurrences of each value in a data set.

### Example

Stage of disease at diagnosis of breast cancer in a random sample of US women.

Stage | Frequency | Relative Frequency |
---|---|---|

0 | 197 | 0.09 |

I | 691 | 0.33 |

II | 703 | 0.34 |

III | 314 | 0.15 |

IV | 187 | 0.09 |

Total | 2092 | 1.00 |

### Computational Resources: Internet-based SOCR Tools

- TBD

### Examples

Computer simulations and real observed data.

- TBD

### Hands-on activities

Step-by-step practice problems.

- TBD

### References

- TBD

- SOCR Home page: http://www.socr.ucla.edu

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